to those bitching about 100 songs, 360 has (or at least had) a limit of 100 songs per playlist.. I really don't see this as too much different. the only way you can "choose" more than 100 songs on the 360 is to either play all songs on shuffle or a single artist on shuffle. so really this doesn't seem too much different from that in that respect..
though it would be nice if this were standardized across the system.