Another free website to watch TV is TVonline. No download, install or invites needed. http://www.tvonline.2ya.com

Lot of webradio & webTV by categories like :

Music : MCM, MTV, TMF, Sunvibz ...
News : CNN, ABC, NBC, BBC, Skynews ...
Comic/Funny : LOL tv, Youtube TV, Comedy channel ...
Sport : Eurosport 1 & 2, ESPN, Star games, NBA TV ...
Sciences / education : NASA TV, Research channel,
Documentaries / travel : Discovery channel, Animal planet, National geo, Globetrekker ...
Movie / cartoon : Cartoon network, Science fi channel, FOX, Western, Action, Mangas ...
Foreigner : TF1, BFM, Al jazeera, CCTV ...
Leisure / Various : Nickelodeon, Smile of a child, Game TV, Netgamming TV, Astro TV, Pocker TV ...