Beginning with 11.0.216. I have added support for Hauppauge WinTV PVR 150 TV card in Media Center. It is not complete yet, but if you have such a device I encourage you to try it.
Also, I have WinTV PVR 250/350 running without any problems for a while. However, considering that there are multiple models (chipsets) of these devices, there may still be problems with some individual devices. Please let me know if you encounter any.
Thanks.
Yaobing