w3prodigy

This plugin changes the internal WordPress script queues for the following AJAX Libraries: jQuery, jQuery UI, Prototype, Scriptaculous, MooTools, Yahoo! User Interface, Dojo, SWFObject, Ext-Core, Chrome Frame and WebFont Loader.

Google Hosted AJAX Libraries

Change the internal WordPress scripts to use Google Hosted Scripts

nigro.simone

This small plugin (10 Kb) enables browser caching in your Apache web server and help browser to cache a local copy of static files and improve page load times.
Configurations are not required! You just have to install it and after the plugin does it all, none further action it’s required.

Speed Up – Browser Caching

Help browser to cache a local copy of static files and improve page load times.

Google Hosted AJAX Libraries vs Speed Up – Browser Caching