TVersity (Windows) has a free and PRO versions. It doesn't support TV Tuner card, but TVersity is definitely worth a try if you are not intereted in watching TV (TV cards are not yet supported), but it allows to stream content from your PC to Apple iPhone, Sony PSP, the Sony PS3, the Xbox 360, the Nintendo Wii, The Nokia 770/N800 and many more devices. Moreover you can stream to multiple devices simultaneously.

TVersity aims to:

• Deliver any media to any device
• Provide a Personal Entertainment Guide (PEG) by allowing users to create a personalized lineup of channels.
• Provide Content Guides by making it easy to access links via organized lists of multimedia content
• Multimedia Social Networking - allowing users to share links with each other