Strong Sad, Strong Mad, and Strong Bad

If you don't know who these characters are then you obviously have not heard about Homestar Runner. HR is a free cartoon available originally only on the internet and done by a few guys who have now quit their job to run the website full time. They generate revenue only by DVD and merchandise sales, which are big sellers with their cult following.

The strength of HR is that it appeals to children and adults alike, just like Family Guy and The Simpsons. However, you have to watch a few cartoons before you get used to the oddly-shaped characters and get to know their personalities.

My favorite by far is Strong Bad. If you've never seen any of the cartoons, I recommend Strong Bad's e-mails. Turn on your speakers, scroll down and just pick a cartoon. I think that "Lures & Jigs", the first one I saw, is probably a good one to start with. "Long pants" is also pretty good.
By the way, new cartoons are added to the site every week.