ZonBox To Come Standalone Too
Zonbu, the $100 Linux-based PC you can get if you sign up for a two-year online storage plan, isn't just a silent, low-power secondary home PC: this thing has hack potential up the wazoo.
While the Zon's a capable machine by itself, the $100 deal is designed for easy consumer operation by people who already have a main PC, and it isn't customizable as a result: you can't install your own software on it or do much of anything else to bugger it up. For $250, however, you can get the box without any restrictions, but lacking the storage service: a great deal for those looking for a small form-factor box to tinker around with.
Based on a custom motherboard, the ZonBox has a VIA C7 CPU clocked at 1.2GHz, 512MB of RAM and a 4GB CF card for storage (700MB for their featuresome Linux build, 384MB for the swap file and the rest to synchronize with the online storage, which comes from Amazon's S3 service.) No hard drive, of course — this was designed to hook into massive wads of online storage — but you can always plug in a USB one or get yer screwdriver out.
Product Page [Zonbu]