...is from hp!  i've got the tz1000 tablet which also allows touch, but the hp tx2z series supports multitouch.  in a growing trend, it also can be purchased with the 64 bit edition of windows vista home premium or ultimate.  it appears to be the same size as the tz1000 which i like - check it out here.  update:  now you can upgrade this to windows 7 which also supports multi touch capabilities!