Tuxmachines.org has nice review of Xfce 4.4beta1, which provides a more detailed overview than my brief list of major changes.

Conclusion: Things are only getting better with xfce4 4.4. Updated interface configurations, new options, and new applications make this release an exciting prospect. If you’ve never tried xfce or haven’t tried it recently, you owe it to yourself to test it out.