WP-Cache is an extremely efficient WordPress page caching system to make your site much faster and responsive. It works by caching Worpress pages and storing them in a static file for serving future requests directly from the file rather than loading and compiling the whole PHP code and then building the page from the database. WP-Cache allows to serve hundred of times more pages per second, and to reduce the response time from several tenths of seconds to less than a millisecond.

WP-Cache started from the “Staticize Reloaded” by matt and billzeller. Most of their recommendations also apply to WP-Cache. Current version, WP-Cache2, is a huge improvement over previous versions of WP-Cache.

Pricing: Free
Requirements: -
Source: http://mnm.uib.es/gallir/wp-cache-2/

For the best results using FeedBurner with your self-hosted WordPress site, we recommend the FeedBurner FeedSmith plugin (originally authored by the awesome Steve Smith). The plugin will detect all ways to access your feed (e.g. http://www.yoursite.com/feed/ or http://www.yoursite.com/wp-rss2.php, etc.), and redirect them to your FeedBurner feed so you can track every possible subscriber. It will forward for your main posts feed, and optionally your main comments feed as well.

Pricing: Free
Requirements: -
Source: http://www.feedburner.com/fb/a/help/wordpress_quickstart

Google (XML) Sitemaps Generator plugin generates a XML-Sitemap compliant sitemap of your WordPress blog. This format is supported by Ask.com, Google, YAHOO and MSN Search.

Features:

• Available for all WordPress versions since 1.5
• No PHP skills or file changes needed
• User interface to customize all parameters like priorities etc.
• Available in many languages
• Generates automatically a sitemap for all types of WordPress pages
• Calculates a priority for each post, based on the number of comments
• Tells Ask.com, Google and YAHOO about changes via ping
• Includes a WordPress filter for other plugins which can add their pages to the sitemap
• Generates a static XML file as well as a zipped version

Pricing: Free
Requirements: Wordpress 1.5+
Source: http://www.arnebrachhold.de/projects/wordpress-plugins/google-xml…

What Others Are Saying allows you to display the most recent post of your favourite blogs somewhere on your site. It utilises the RSS link field from the blogroll for each of your links. If the RSS link exists it attempts to get the last post from it. It then displays the most recent X number of posts depending on your settings. Each blog can have one post in the list.

The plugin simply outputs the post and site name wrapped in a list item, so you would need to insert the above code into either an unordered or ordered list, and also give it a header. So that people don’t need to edit the plugin file to change their markup.

Pricing: Free
Requirements: Wordpress 2.0.7+
Source: http://www.stuffbysarah.net/blog/wordpress-plugins/what-others-are-saying/