I tried getting compiz working and it sort of works, except that all my window decorations are gone. And I get the following when I run it.
compiz: Failed to load slide: freedesktop
compiz: Couldn't load plugin 'gtk-window-decorator'
BTW, this is also in xfce, but i've tried it in kde with the same results.
You aren't the only one wondering how to get this working. If I find something out I'll follow up in this post.