Put this in general storage as most peeps might not think of it as a viable alternative and no look in the NAS section.
 
To my mind, Netgear has a helluva product here with their Ready NAS Duo.  Kicks but on it's only competition being twice as fast, hot swappable, 2 more USB ports, way more features,  
 
    [quote]*   Provides extra storage that can be conveniently shared with all your computers.  The ReadyNAS Duo is perfect for homes with more than one computer. Unlike a USB drive, the ReadyNAS connects to the network and is simultaneously accessible via all connected Windows or Macintosh computers.
    * Access stored content anywhere via the Internet. Creates a personal webpage to easily share photos with friends and family.  If there is a broadband Internet connection and a home router, the ReadyNAS can be set up to provide secure access to all the stored files remotely via the Internet.
    * Optional “spare” hot swappable hard drive protects against drive failure by making a duplicate copy of all your data.  For added protection of stored data, an optional second hard disk drive can be installed. The spare hard drive will keep an extra copy of all the data and instantly take over if the first hard drive should fail.
    * Supports most network music, picture and video players.  Advanced media streaming support allows the ReadyNAS to directly serve media, with no PC required, to devices such as the NETGEAR EVA8000, Sonos® Digital Music System, Logitech Squeezebox™, Apple iTunes® clients, Sony Playstation® 3 and Microsoft Xbox 360®.
    * Embedded BitTorrent™ client for direct downloading from the Internet.  Officially licensed BitTorrent client allows downloading to occur without the need for an additional computer. A Web-based interface facilitates download management from computers, and a special NETGEAR Digital Entertainer interface allows management from the EVA8000.
     
At CES they did a demo where they yanked one of the two drives while a movie was running of it and it didn't even blip.
 
Reviews here:
 
http://www.pcmag.com/article2/0,2817,2280652,00.asp
http://www.mydigitalentertainer.co [...] -Overview/
 
Here's the newegg links
 
500 GB Model - http://www.newegg.com/Product/Prod [...] 6822122020
750 GB Model - http://www.newegg.com/Product/Prod [...] 6822122021  
1 Tb Model - http://www.newegg.com/Product/Prod [...] 6822122022
 
Only problem is, I have seen them reviewed in two different spots; one had a 7200.11 in it, one had a WD5000AAKS.  Makes a bit hard to order the thing with the 2nd drive if ya don't know what the 1st one is.