With this extension you will be able to archive older orders so those are not shown on the “Sales -> Orders” grid.

The orders are not deleted, just not returned when you query the database for current orders.
You can see the archived orders on a new grid specially created for this orders.

To archive an order you have to select the orders from the Sales Orders grid and on the mass action select, choose “Archive” the selected orders will be then archived.

On a future version I will add the feature to automatically archive orders older than “X” days.
You can get this extension at the price of $ 69 american dollars.
Worth taking a look:
The recording of the highly attended kick off of the new Magento Developer Solutions series of webinars is now available on the Magento Webinar Archive. Be sure to check out recordings of our other great webinars as well, all on the Magento Webinar Archive.
Source: http://www.magentocommerce.com/blog/comments/now-available-best-practices-for-magento-development-in-the-webinar-archive/

With this extension when a user visits any page of your store, if they are using a browser that supports
OpenSearch they will have the possibility to add your webiste to their Search engines list, so they do not have to visit your website in order to search for something.
OpenSearch is a collection of simple formats for the sharing of search results.
The OpenSearch description document format can be used to describe a search engine so that it can be used by search client applications.

The OpenSearch response elements can be used to extend existing syndication formats, such as RSS and Atom, with the extra metadata needed to return search results.
You can purchase this extension only at $21!
If you get an error like this:
with message ‘Warning: Invalid argument supplied for foreach() in /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Abstract.php on line ...
try using this code
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
Mexican regions, distritos mejicanos
Development of Medicare’s website
This website is developed using:
Ajax is used, degrades gracefully, because the intention was that the header “never” reloads.
xHTML/CSS coding is done by Ziongem
Most of the content is static and are just ctp files (CakePHP template extensions).
It was nice to develop this website since after it was done, the designer told me “hey! but the header shouldnt reload on every click”, “okay” I said, lets put some ajax on it! 
After seeing Damian Culotta’s I have a released on for my country
The extension can be found here
The extension is coded in a way that upon installation looks for regions on the config.xml file, iterates over those and inserts the into database, flexible and simple.
I hope to see a lot of Uruguayan ecommerce site with this extension installed. 
Simple tip where you will get the code to “extract” current Magento url from a template file.
Here is the code.
You can use it on any phtml file.
$this->helper('core/url')->getCurrentUrl()
Behind the scenes, this calls a helper method and retrieves the current url.
You can also use this on any file by changing it to this code:
Mage::helper('core/url')->getCurrentUrl()
With this extension you wont have to worry about backing up your database or using external scripts, tools to do so.
You just need Magento’s cron up and running, and this module will do the rest.
You can find more information on how to setup Magento’s cron jobs here: http://www.magentocommerce.com/wiki/how_to/how_to_setup_a_cron_job
The module creates a backup of your database every day at 1am, the backup is saved on Magento’s backup list, that you can find under, System -> Tools -> Backups
Also, along with this feature, you will find a file called: “centerax_db_backup.php”, with this file you can create a backup of the database from the command line by executing this line: “/absolute/path/to/bin/php -f /absolute/path/to/magento/centerax_db_backup.php”
You will find those backups on the Magento’s backup list also.
In order to change when the module creates a backup you must edit this file: “app/code/community/Centerax/AutomaticBackup/etc/config.xml” on line 34.
For example, if you want backups every week (every monday at 1am), you should change: “<cron_expr>0 1 * * *</cron_expr>” to “<cron_expr>* 1 * * 1</cron_expr>”
You can find more information on cron expressions here: http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/
You can get the extension on Magento Connect
What is a product feed?

A product feed is a data file that lists information about all of your products in a specific format.
Unless you have a Yahoo! Store, Merchant Solutions, or ProStores account, you must create and upload a feed to Product Submit to have your listings displayed.
With this extension you just select the products you want to add to the feed, and click on “Submit” on the mass action toolbar, and done!
You will be prompted to download the generated file. Isn’t that easy?
Your products will be featured prominently in Yahoo! Shopping and appear in highly relevant areas across Yahoo!, giving you access to millions of motivated buyers.
Here is some information on how to upload a product feed: http://help.yahoo.com/l/us/yahoo/ysm/ps/submit/submit-07.html
Extension price: USD 25
Please note: If you have a Yahoo! Store, Merchant Solutions, or ProStores account, you do not need to create a product feed. Product Submit will automatically extract your product details directly from your store.
What is a product feed?
A product feed is a data file that lists information about all of your products in a specific format.
Unless you have a Yahoo! Store, Merchant Solutions, or ProStores account, you must create and upload a feed to Product Submit to have your listings displayed.
With this extension you just select the products you want to add to the feed, and click on “Submit” on the mass action toolbar, and done!
You will be prompted to download the generated file. Isn’t that easy?
Your products will be featured prominently in Yahoo! Shopping and appear in highly relevant areas across Yahoo!, giving you access to millions of motivated buyers.
Here is some information on how to upload a product feed: http://help.yahoo.com/l/us/yahoo/ysm/ps/submit/submit-07.html
Please note: If you have a Yahoo! Store, Merchant Solutions, or ProStores account, you do not need to create a product feed. Product Submit will automatically extract your product details directly from your store.