First: nice plugins and nice community you have here :wink:
I've tested the Ultimate Facebook Plugin and I miss an important feature: Post activities to user's wall.
It should work in this way: For example I've online games site and each time when a user plays a game on his FB Wall a new post should be created: "I'm playing XXX Game on XXX site..." or something like that.
There could be a time restriction, too: Create max. XX posts within one hour...
I think that would be a great feature to increase visits from fb.