DD-Wrt vs. Tomato vs. OpenWrt vs. FreeWrt

[DPic]

So many choices! Can someone familiar break them all down and compare them for us?

[DPic]

Anybody? I'd just like to know a few things:

How the projects differ in their goals
How they all compare in:
Compatibility
Functionality
Usability


Thanks

[UbuWu]

Wikipedia has some pretty good information on all of them : http://en.wikipedia.org/wiki/WRT54G#Third-party_firmware_projects