This is probably the best flash series ever!
They make episodes themselves, but they also do "Sbemail" where people email them and they answer it in a flash cartoon. They also make games but they're not as good as these ones. Unlike this site they make all their money off the store so there is no ads. Here is the site.

P.s. they're making a homstarruner Wiiware Game!!! Here is the site for more details