The Group in New Folder script in the Big Cat Scripts Plug-in was my favorite Finder tool for a long time, and I was very upset when it was broken in Leopard. I have managed to hack togather something that can be activated using AmScriptsCMX(UB).
Here is my script. To use it, first nstall AmScriptsCMX(UB) and put the below script in ~/Library/Scripts.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20081228194846872