I would much rather use a PS3 as a media server in all fairness, it's really really good.
Plus I do need to ocassionally do other important things, look at p**n etc etc...
yes you will
hdmi only transmits video
No MKV playback though
Not sure how much Sony will bother addressing this as the vast majority of MKV files are pretty much pirated HD stuff, and well known for it too.
MKV2VOB does a good and quick enough job for me.
Pretty sure i watched top gear mkv in HD the other night via my PS3 :/