a website (icanhascheezburger.com) featuring many user-created images of lolcats, as well as other animals, like lolbunnys and lolruses (walruses). Most are images of animals, especially cats, with lolspeak captions.
Some running themes are: Lolrus' "bukkit," ceiling cat and basement cat, and other general mayhem.
I Can Has Cheezburger also has a spinoff site called "I Has A Hotdog," which features loldogs.