Since kernel 3.6.0 a feature called "Suspend to both" has been implemented so now it is possible to use hybrid suspend with pm-utils without using uswsusp or tuxonice as a SLEEP_MODULE.

http://kernelnewbies.org/Linux_3.6#head-c3f337f7aee4ab30acbea016f5ba8a081979392d
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610380

Currently pm-utils, when asked to do hybrid suspend, suspends a laptop for a specifed ammount of time, than wakes it up and does hibernation. I believe this patch for pm-utils is needed to fully support pm-suspend-hybrid action in pm-utils:

http://marc.info/?l=freedesktop-pm-utils&m=134087583006804

Whatever the status is now for pm-utils, I belive that we should see patches following this issue quite soon.

What xfce currently seems to be lacking is the ability to either: 
1. Configure suspend action (for currently available suspend button in UI) to utilize hybrid suspend,
2. A clickable UI dialog labeled "Hybrid Suspend" in menus and End session dialogs that initiates hybrid suspend.

I think that a separate option (2) would be ideal. This should be easy enough to implement (copy/paste & change the action behind button).