A web performance expert who works for a small company in California
Browser based Ruby learning tool
An absolute godsend for putting a site together quickly.. including this one!
Zend Framework Form decorators for Twitter's Bootstrap UI.. Very useful
jQuery BBQ: Back Button & Query Library. A really handy library for ajax based url/fragment manipulation / parsing and so forth.
Very useful if you ever need to go digging into the jQuery source!
The UI Layout plug-in can create any UI look you want - from simple headers or sidebars, to a complex application with toolbars, menus, help-panels, status bars, sub-forms, etc..