I tried the original release of this, and it was abit flaky, but a good concept.
Since the PowerPack 1 release, I have not got a 120 day eval, and I have been running it about a week, and I have to say I think Microsoft have come up with a really good product for the home.
It takes daily backups of all the windows machines on the network, I can then do individual file restores, or in the event of a HD failure, and complete image restore to a machine over the network, it really does work well.
It doesnt support RAID, but uses its own version called drive externder, to create duplicate copies of data across HD's. You manage the whole thing from a console, and loads of plugins are available.
Its all based on 2003 server, and I really am impressed with it. Its being released on MSDN soon to, so once its on there I will do a proper setup.
It also does all the streaming of movies, music etc over the network to wireless streaming boxes, PS3, 360 etc. You can also remotely authenticate online and access files from a web interface, and even remote connect to the console if needed.
Not so much a hacking tool or anything, but if you have a home network might be worth a look, as a central storage repository. You can also back up the server shared data to removable storage also.
Oh and I can also connect my Linux boxes seemlessly to access data.
For once I have to say, well done Microsoft. So far so good on this once since the PP1 release.