In the the post at BS (nee AoMM nee DbD), Jason pays the due to the enthusiasm K-ON generates in the masses.

It’s the social media show of 2009 – K-On! has just generated more fan art and more YouTube clips than any other series of the year. Things really got kicked off with the first airing of Don’t say “lazy”, which just flooded the web with mini-top hat Mio images (not a bad thing)… and things really then got crazy with the infamous “Moe~ moe~ kyun!” and Azu-nyan.

I thumb my nose at MADs like those that he linked, but he's right: K-ON opened the floodgates of wonderful, from Marco and Shows to Josh Garrado. K-ON is a true people's anime.