Shuttle XPC x100
Spotted at the CeBIT convention, Shuttle will be releasing another SFF computer, this time based off of Intel's Core architecture. This might be the Mac Mini equivalent on the PC side. Yes, I do remember that AOpen MiniPC, but that's slow compared to the new Shuttle x100. Here are few specifications to get you riled up: T2400 Core Duo (1.83GHz) CPU, DDR2 RAM, ATI Mobility Radeon X1400 graphics, Gigabit Ethernet and support for a SATA II 3.5" hard drive. That last one has me going crazy. Imagine a 10,000RPM Western Digital Raptor hard drive in that thing! The x100's dimensions are larger than the Mac Mini, as it's compared to the size of a sheet of A4 paper.
The graphics are modular, based on the MXM slot, often found in high-end notebooks. This means you aren't stuck with the same graphics chip and can upgrade down the line if you so choose. The x100 will be aimed at HTPCers and therefore sold as a full computer from Shuttle, bundled with Windows XP Media Center Edition. I can only hope that they also release it as a barebones computer as well.