What are the best Slice Of Life's

A couple years ago I watched one called Sket Dance. At first I wasn't crazy about it, but then when I watched that one episode where they are playing a Super Mario Bros. clone I got hooked. I got really attached to the characters. The new ones that came in were even fantastic. By far the funniest Slice Of Life anime I have ever watched. What are some really great ones I should check out?