Yup, I've started using TVersity after boblinds suggested it (cheers m8). It's easy to set up and works very well with Media Streamer on the N770. And it's free.

I tried SimpleCenter first but as NastyGash has already stated, it can be slow (also, there is a charge for using it). I also tried Windows Media Player 11 but it is DOG slow. It slowed my PC up (not a very fast one I'll admit) but more annoyingly, it slowed the N770 right down. I've got over 130 gig of music and sometimes Media Streamer would just hang trying to display all of those folders. Sloooooooow sloooooow sloooooow.

Using TVersity is VERY fast - I'm hooked. Mind you, I haven't had a chance to get the video working yet - I'll try during the week.