I signed up to test the new Windows Home Server Public Beta a while back and received an invitation to download and review it.
Like a lot of people I am frequently running out of storage space on my machines and needing to upgrade. I am also fairly concerned about data backups too, so much so that I upgraded my main machine a while back to include a SATA RAID 1 mirror for my core data over 2 x 320GB drives.
Most people however don't have the need or knowledge to set up a decent backup or redundancy solution, so Windows Home Server when purchased installed on a piece of purposely designed hardware should fill this gap in the market.
When I get a spare few minutes I'll download the DVD and test on an un-used machine. I'm particularly interested in the usability of the software since it will mostly likely be bought by and used by people who are not particularly technically minded.
From what I've heard it does not include Media Center (since it's a headless OS), but it features Windows Media Connect, so I'll be able to stream my music and video straight to my XBOX 360 without having to have my main machine running.