Vector has packaged the latest stable release of Xfce4 for VL 6.0. Please note that there is also a newer beta package in the repository. If installing with slapt-get you'll have to use the full package name:
slapt-get --install xfce4-4.4.3-i586-3vl6.tlz
Otherwise you'll get the 4.6 beta package which will likely contain the bugs you expect in a beta. Folks who use gslapt should be able to see both packages.
Package Size: 12.52 MB
Installed Size: 54.55 MB
Sources: Will be posted shortly.
Description: Will be posted shortly.
After testing this package, please take a moment and come back to this thread to let us know how it works for you.