It's always on, so it's a great home storage server (I have a Drobo w/ 4.5TB of storage attached via FireWire 800).
It downloads torrents & podcasts nicely.
Also, the shared library support coming in Plex/Nine looks killer. I'm looking forward to running Plex on my MacBook without having to maintain a separate metadata library.
If a boxee box does the job for $200, has 1080p, 7.1 out, 802.11n / Gig.E why bother spending $600?
I hope the Logitech setup GoogleTv box does the job.