I'll have to add my vote for a Sheevaplug where the PSU has failed in around 6 months running semi-continuously on 240V
Yesterday I woke up to find that my Sheevplug-based fileserver was unavailable and that the MCB in my consumer unit dealing with the socket it was plugged into (with other things) had tripped.
Checking everything out, and it was one of my Sheevaplugs that had failed - burnt smell coming from the casing, no lights, fuses intact. Everything else connected to the same surge protector strip (another Sheevaplug, router, modem, Gigabit switch) were all fine.
The plug in question is about 6-7 months old and was connected to a (powered) multi-disk USB enclosure; the SD card with a Debian install appears to be fine.
For now I've resorted to bringing up an old NSLU2 with Debian and connected that to my USB enclosure just to give me a fileserver again - forgotten just how slow an NSLU2 is running Debian though :-( .
NewIT, where I bought my plugs from, replied very promptly and said that they are expecting some PSUs in from Globalscale within a few weeks and will contact me, so I guess I'll have to wait and see where this goes. Were it not for the warranty, and sticker covering the casing to enforce it, I'd have opened it up to have a poke around, but from the burnt electrics smell I'm pretty sure it's a blown capacitor or some such.