Just wanted to pass on my experiences with the NSLU2: I have Win XP SP2, MAC OSX 10.4.9 & XBOX XBMC 3CTH 2007-04-01 First change to the NSLU2 was to remove the under-clocking resistor. All testing was done with UPNP un-selected. I had the NSLU2 setup with 2 hard disks both in EXT3 format using V23R63, I was experiencing slow browsing from Win XP / MAC and unknown user from XBMC - Even though I had Guest user access allowed, I also tried specifying a name/password which was known on the NSLU2. I disabled XP Firewall & network checking for remote Printers & Scheduled Tasks in Win XP which reduced the delay to 30 seconds for XP browsing. Next I upgraded the NSLU2 to V23R72 and found the exact same results for all three platforms. Then I downgraded the NSLU2 to V23R25 and found the following: Win XP - Instantaneous Browsing (Leaving other XP changes as per above). MAC - Instantananeous Browsing. XBOX - NO "User Unknown" error with either a named user or using Guest access with SMB. Large file downloads and uploads does not produce connection lost error as reported by other users. I realise that I can only have 2 * EXT3 HDD's in this version - But it should satisfy my current needs - If I do need to access the HDD's from a local machine I do have a free EXT2/3 driver that does work under XP. Access to USB attached HDD's is acceptable and streaming video content to XBOX works great. I don't know what has been changed since V23R25 to produce this behaviour, but after much fiddling I will stick with this configuration for now. Hope this helps some other users. Tom.