I picked this up just after Christmas. Patriot Javelin S4 Media Server 4 Bay NAS
http://www.memoryexpress.com/Products/MX33892
I upgraded from my DNS-323 which was running out of room (due to being 2 bay) and it was painfully slow. The Javelin is noticeably faster, although the software it comes with it crashes all to hell on my Win7 box. The web gui works alright - but doesnt seem as user friendly as the DNS-323.
It states the NAS is DLNA certified, but I havent found an app on my Android phone that will detect and play music/movies properly (but its probably cause I have no idea what app to use)