Server 2003 is based on XP and 2008 on Win7. So what ever cards work in those cases should work with the server version.
I have a TV card is very old "life view"
And is working on windows 2003
On Windows 2008 32bit or 64bit does not work.
I broadcast with a software called Windows Media Encoder.
its work on windows 7.
I am also looking for the new pci-e or mini pci-e TV tuner to the server 2008 64bit or 32bit.
If you find send me an email please.