XBMC 11 is released
I'll give this a shot, but I'm not optimistic. I have an Nvidia Ion graphics card in my HTPC, and h.264 acceleration doesn't work with anything other than MPC-HC (I tried XBMC 10). It's really too bad, because the Ion chipsets are wonderful for HTPCs, and XBMC has a great UI. A combination of the two has the potential to be a great HTPC that actually plays everything (instead of the half-assedness of Apple TV or Roku).