while I get ready with the “links” section of this page, check out this article about implementing rounded corners without having to switch images when backgrounds are different colours: using a transparent image
http://www.alistapart.com/articles/mountaintop/
Need to check if this is cross-browser, tough… you know sometimes CSS behaves unexpectedly when you switch browsers or OS update: checked, it works fine on Explorer, Mozilla & Firefox (both Linux and Windows) and Safari (in MacOS X). I’ve actually used it for the dnc-webparts web page