I've been thinking along these lines recently too; something that I can run 24/7 that will have next to no impact on the electric bill. I saw a thread on another forum (hardforum, if I'm allowed to say that :O) of a guy who built a file server type machine with an Atom processor/mobo dealio, a picoPSU and a custom case. Now, I'm willing to build a custom case if needs be (I've got a tupperware box lined up for testing
), but I'm curious as to where I can find a reasonable power block for the PSU? If anyone has any experience with these things, please let me know (either via PM or in this thread, if it's allowed). Many thanks 
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