The good folks at Extremetech have a story about a cylindrical PC case called the Piston, built by Taiwanese company First International Computer Inc (FIC). It supports an Intel Prescott series P4 processor up to 3.8 GHz, has a pair of DDR 333/400 DIMM slots, and can take a mini-PCI card. Stereo speakers are built into the case, which should retail for about $400.
Hardware Beyond the Hype