Just wanted to thank you for your detailed description. I spent many hours reading various forums, technical guides, but without you I couldn't make it.
I'll try to add as many keywords to this post as possible so other people can find it as well:
Basically I tried to share the internet on my Windows 7 PC for my Sony Bravia TV using a cross-over cable as I couldn't be bothered to add one more router to the network. The PC is connected to a Linksys router via WiFi, and have a stable connection and it's running most of the time anyway. I thought that I'm not a lame on that networking subject, but it just didn't wanted to work with the bloody network sharing function, which was suggested on all the other sites. But once I activated the bridge connection, it's worked straight away and now I can watch various online videos on my TV. So cheeeers!!!!