CSS Gradients:
http://ie.microsoft.com/testdrive/graphics/cssgradientbackgroundmaker/default.html

CSS rounded Corners:
http://www.css3.info/preview/rounded-border/

36 JQuery Nav Menus:
http://www.1stwebdesigner.com/css/36-eye-catching-jquery-navigation-menus/

Drop Down JQuery Menus:
http://www.queness.com/post/1513/14-outstanding-jquery-navigation-menu-tutorials

 

45 Useful jQuery Menu Plugins For Better Navigation:

http://www.tripwiremagazine.com/2011/12/jquery-menu-plugins.html

 

Add Motion To Website: jQuery Animation Plugins From 2010

 

30 Stylish jQuery Tooltip Plugins For Catchy Designs

 

300+ Jquery, CSS, MooTools and JS navigation menus