Have you tried Hulu yet? The latest web-based to bring television to your computer has just opened to the public. We've been testing it out for a few months now, and have been fairly happy with the site. In our quest to live life without cable tv Hulu has proven to be a constant source of entertainment.
Hulu is affiliated with NBC Universal, so you'll find all your favorite NBC shows, as well as some Fox and Bravo selections. We've been disappointed that they've only occasionally put up full episodes of Bravo shows, like Project Runway and instead have short clips that can be found elsewhere on the web.
The player itself is easy to use, and the highlight for us is the continuous play. Not needing to click continue after the commercial (like you must do in ABC's player), allows you to truly watch TV in the traditional style...from your couch.