I have consistently been impressed by the number and quality of JQuery plugins that abound. Today at work we ran across JQuery Corners. This friggin' awesome plugin allows you to put rounded corners on your divs and it's oh, so easy.It used to be when you wanted that pod of content to have pretty rounded corners you had to start slicing images up. JQuery Corners doesn't just do rounded corners-- there are a whole slew of shapes you can apply including border mods all with JavaScript and CSS via a couple lines of code. The other beautiful things is it works in Firefox, and IE both. (And I assume other browsers as well.)
[code]jQuery('#corner_example1').corner("30px");[/code]

[code]jQuery('#corner_example1').corner("bite 30px");[/code]

Here is a kick-butt demo page:
http://www.malsup.com/jquery/corner/