Samer Bechara

This plugin allows your website visitors to set the number of posts they see per page. It will insert a form at the top of your posts page in order to allow your website visitors to quickly set the number of posts they want to see per page.
Detailed Features
User Posts Per Page allows your website visitors to set the number of posts per page, and remembers that number everytime they reach your website.
<ul>
<li>Works with posts, pages and custom post types </li>
<li>Works on Category pages, tag pages, author pages, archive pages, and custom post type archive pages.</li>
<li>Number of posts per page remembered for logged in users</li>
<li>Cookie set for non-logged in users to remember settings</li>
<li>On network installs, network administrator is able to set the default number of posts per page across the whole network</li>
</ul>
Plugin Usage
<ul>
<li>Go to Appearance->Widgets and add your widget to any sidebar of any archive page</li>
<li>Alternatively, you can use the shortcode [user_posts_per_page] to insert this in your theme using 
the function <code>echo do_shortcode('[user_posts_per_page]');</code></li>
</ul>

User Posts Per Page

Allows the user to dynamically set the number of posts to show per page on category pages, tag pages, author pages and all other archive pages.

bluenet

Take MarketPress to the next level. As the name implies, MarketPress Product Importer enables users of the WPMU DEV plugin MarketPress, to quickly and easily import products to their online store, or product listing site. If you manage affiliate sites, you need this plugin.
When this plugin is activated, a new database table is created for storing the product data temporarily. In order to run the importer, that table needs to be populated with the users product information. I’m planning to integrate the CSV import directly into the plugin, but for now, I’m using <a href="http://bluenetpublishing.com/wp-content/uploads/2012/01/csvisual.zip" title="http://bluenetpublishing.com/wp-content/uploads/2012/01/csvisual.zip" rel="nofollow ugc">CSVisual</a>, an edited version of <a href="http://i1t2b3.com/2009/01/14/quick-csv-import-with-mapping/" title="http://i1t2b3.com/2009/01/14/quick-csv-import-with-mapping/" rel="nofollow ugc">Quick CSV import with Visual Mapping</a> by Alexander Skakunov.
Once the product data has been added to the (_mpimporter) table, the plugin will recognize it, and show the “number of products” available, as well as, an “Import Now” button.
Simply click the “Import Now” button, and the plugin will import your new products. NOTE: Data in the (_mpimporter) table is not deleted, so running the import again will just create copies of the products in MarketPress. I’m working on an update to handle this, so users will have the ability to update existing MarketPress products, without having a duplicate record created.
<h4>Currently Supported Features</h4>
<ul>
<li>Basic Product Data</li>
<li>Featured Images</li>
<li>Product Categories</li>
<li>Product Tags</li>
<li>Product SKU’s</li>
<li>Product Price</li>
<li>Product Sale Price</li>
<li>External Product Links</li>
</ul>
For complete setup and usage instructions with screenshots, visit <a href="http://bluenetpublishing.com/plugins/marketpress-product-importer/" title="http://bluenetpublishing.com/plugins/marketpress-product-importer/" rel="nofollow ugc">MarketPress Product Importer Development</a>.

MarketPress Product Importer

MarketPress Product Importer enables users to import products directly into MarketPress.  The best, free eCommerce plugin available for WordPress.

User Posts Per Page vs MarketPress Product Importer