If you’re new to JQuery and want to learn or already know enough, but lazy to write JQuery code by hand, have a look at Microsoft’s Glimmer Lab. Glimmer is a free tool you can download and there are wizards you can use to spit out Html, Css and JQuery code in a .js file for you. Some cool things you can at the moment are DropDown Menus and Tooltips.
Just follow the wizard and you get your cool effects in a flash! This is Version 1.0 and I’m looking forward to see more cool things to be made available for developers. Simply awesome.