Or an iMac G3 running for a few hours.
nah, G5s were known for their heat issues.. G3's get warm but nothing compared to G5's (they never made a G5 Powerbook, but made a G3 and G4 model.)
On topic - heres my messy desk for tonight.. trying to copy some files over from my server before I hackintosh it, and make it into a hack server
got the mini running snow leopard, vnc'd to the imac, apple keyboard and mouse connected to the server, which is on the right, splayed open
oh, and if anyone asks, the glass on my desk is from a Disaronno package, and yes, thats whats in it. Good stuff