Watchthesimpsonsonline.net
WatchTheSimpsonsOnline (www.wtso.net) is a website that features all 23 seasons of The Simpsons. It also includes some of the Shorts which first appeared on The Tracy Ullman Show in 1987 and The Simpsons Movie, which came out in 2007. The Website also caters for fans of The Simpsons Comics, with 134 full length comics.
The website is continuously being updated, with new HQ episodes being added each week during seasons. It is currently adding episodes from season 21, beginning with "Homer the Whopper", broadcast on September 27, 2009. Watching the episodes is completely free of charge and you don't need an account to watch the episodes or read the comics, but if you would like to join forums or leave comments you have to set up an account. Even though rare, it is possible to get a virus, but it is very rare.
The Website is currently celebrating it's two year anniversary.