This page is very useful. Thank you for creating it.
In addition to the categories/features you have listed already, I suggest something about its status/usefulness -- like "Who would use this?" For example, FSO milestone 1 is probably "Developers only".
Also, it might be useful to have something that succinctly describes the expected target state for each distribution. For example, FSO is the "Strategic framework for Openmoko".
I know this is a Wiki and I wouldn't mind doing this myself, but I thought I'd bounce the idea out there first.