Hi,
There are some free websites which I use sometimes to watch tv on internet.
Like

http://wwitv.com
http://beelinetv.com/

The site I found good is
http://www.imvite.com/

Moreover, Mediacenter is a software I use to watch free tv on internet. You can download it from
http://www.coolstreaming.it/

Recently, I came to know about "jumptv" and it is pretty good, you can pay for a channel to for a pakage and watch on internet, the quality is really good.
www.JumpTV.com

good luck