Yes, I'm using the 1TB White Light Network Storage from Western Digital My Book World, which has Twonky Media pre installed for private networks.
Device is connected to wireless router via ethernet....assigned internal ip, Doesn't pick up External IP as you probably will notice Twonky Media Servers do on most devices....
Currently, all wireless devices are accessing this device both wired and wireless devices: MAC/PC/PS3/iPod Touch/HTC Hero and HTC Diamond
All devices as media receivers are receiving streaming surprisingly well on linksys wrt160n draft n technologies.
It has both an iTunes Server and Media Server Ability.
Time Machine Backups up to the Devices with minimal issues....(only major issue is that Time Machine will try to hog entire drive, despite trying to use Quota Services)
Thus, far .avi, divx, xvid, and 720p vidz are a go! (minimal stuttering and jumping)
MAC and PC are able to see each other and transfer files between Network Storage Shared Folders or directly.
GUI Admin Pages are very slow, but network services are pretty good.
I can hit the device from outside my personal network, and get a couple pages into Twonky Media Server before the external and internal ip address translation fails. MIONET software is provided to access the device, but I'm not happy with this set up. (Should have read the fine print on the box!)
So, Overall, I'm satisfied, but really wish I could access my media server and network folders from outside my network without having to remote desktop or vpn.