These links are just a few TV online links I found after 15 minutes of searching. This gives you a start for internet sourcing of Television Entertainment!

hulu 
The best website bar none, for online TV content

tv.com  
Another site with various TV shows online

joost.com  
Site with a lot of online TV content

video.aol.com  
Has lots to content.  Great source for older TV shows and reruns

surfthechannel.com  
Aggregation service.  Linked to Hulu, DailyMotion, etc.

findinternettv.com  
Aggregation service

antennaweb.org  
For locating and tuning your over the air channels.

www.nbc.com

www.cbs.com

www.abc.com

www.fox.com