It's been a while since I've posted. So, here's a new tip:
For a custom tv show on your Sims TV.
Copy your own AVI files to the "c:\mydocuments\eagames\thesims2\music\[television station]\" folder. Note: The AVI file must have a 128x128 resolution and a frame rate less than or equal to 15 fps.
I personally haven't tried it yet but i think I will. It sounds cool.