Follow up:

Hulu
http://www.hulu.com/

I have been looking for a website for quite some time that features channels from various websites and actual tv channels. Once in a while, it is nice to watch television at your computer desk. With over 3,000 channels, TVChannelsFree is a great way to achieve this.

Here are some other popular webTV sites:

Inner-Channel
http://www.inner-live.com/

Channel Chooser
http://www.channelchooser.com/
I like this website because it is very user friendly and organized.

WWITV
http://wwitv.com/portal.htm
This website barrows streams form other websites and people who setup tv servers that stream movies that cycle through with zero commercials. Yep, commercial free!

Justin.TV
http://www.justin.tv/

Here is a list of popular channels:

Animal World

Discovery Channel

Discovery World

Discovery Science

HGTV

I think perhaps that some channels will lag a bit on a WiFi connection. Or it could be the channel's bandwidth. But look through channels and websites and comment what ones work well for you.

Related Questions:
How do I watch free TV on my computer?
Can I watch free Television on my PC?