Eventually this page will have a list of people, places, sites, apps, and stuff that I find interesting. But in the meantime...
hoverIntent jQuery plug-in
Similar to jQuery's hover. However, hoverIntent tracks the user's mouse and waits until it slows down before calling the onMouseOver function.
jVariations jQuery plug-in
The purpose of this plug-in is to allow developers to include all corner cases of code on a page, and dynamically show/hide blocks as desired.