Didier Brun of ByteArray.org fame has released a free set of Flash CS3/AS3 UI components, offered as an alternative to those provided by Adobe.
I was never a big fan of the AS2 components provided with Flash MX2004 and 8, and when in a bind I would often find myself using Keith Peter's Bit Component set as a replacement. Over time I found myself using them almost exclusively. Now if the same scenario plays out with the AS3/CS3 components, there appears to be a great replacement.
Check out the blog post to see all the features of the component set.