Xen-aware box ?
MSI just announced the WindBox III ; an Intel® Core™ 2 Duo powered machine and fanless system!
Core™ 2 Duo is supposed to be VT-x capable and “Two DDR2 SO-DIMM slots support up to 4GB”. And an SSD drive and you get a virtualization-ready silent box :-D
Full announcement is available here: MSI IPC Launches WindBOX III with Intel Core 2 Duo for Fanless System .