Here are some websites where you can freely watch popular TV shows, movies, cartoons and other entertainment content on the Internet.
1. TV-Links (no longer online) - This site is extremely popular, comprehensive and always up-to-date video directory. ASide from featuring TV shows, it also offers cartoons, animes, movies, music videos, and sports categories. There are huge number of shows, lots of good video quality shows, few broken links, full-screen mode and more.
2. Alluc.org - This site listed the top rated cartoons, animes, TV shows, movies, music videos, sport channels, and documentaries. You can also view the most viewed and top voted TV shows. This is a great site where you can choose a lot and different genres of videos. The design is simple and you can easily find what you are looking for.
3. Sidereel.com - This is a Wiki-style directory offering lots of movies, music videos, and TV shows. Aside from listing links to full-length web videos, it also lists destinations where you can buy related shows/movies. You can also read featured articles and reviews from different members and posties.
4. TV-Video.net - This website only lists TV shows, but they have the complete episodes of Prison Break, Heroes, Grey's Anatomy, 24, SmallVille, Lost, House, Desperate Housewifes, and more.
5. AllOfTV.net - This is a great resource for animes, cartoons, music videos, and TV shows. You can also find here humor and music clips, as well as news and current events. If you wish to search, chat, comment, and other activities, you can register for free.
6. Peekvid.com - Same as the above websites where you can watch TV series, cartoons, anime, movies, music videos, and more. They also offer a feature called "Most Viewed Videos" where you can check the most popular video in town.