Power supplies which can be controlled via IP seem like a pretty sound idea for sysadmins who don’t want to get called out at 2am to reboot a server.
They’re pretty expensive though, which made me realise that they’re an ideal application for the uCsimm “linux on a tiny low power board”. The boards come pre-installed with Linux, and has builtin ethernet and 18 i/o lines. Add a few relays, install a secure webserver and, hey-presto, homebrew remote power control.