Rounded corners are a little more pleasing to the eye than the hard edges of most UI areas.  These guys found a way to implement a programmatic way to draw the rounded corners and set it all up.  While it looks cool I'm not sure if I'll ever use it but who knows?  Better give some links just in case.

Original:

http://datawebcontrols.com/demos/RoundedCorners.aspx

Templated

http://www.codeproject.com/aspnet/bxTemplateRC.asp

Download:

http://aspnet.4guysfromrolla.com/code/RoundedCorners.zip