For those into gimmicks...
I like playing around with xcompmgr combined with transset-df and wanted to use the same under Core with nvidia and Xorg. So I made an extension that combines them. I tested it and it works quite well. I will be submitting it today.
edit: Is anyone interested in testing this for me? I can send them the .tcz file (24KB), all it requires is a video driver that supports the Composite extension. I have created the md5 file, the info file (for instructions) and will create the list file, I just want to make sure that at least one other person can confirm it works.