Chocotto Sister is a comedy, despite some of the material and content.
Today in Class 5-2 is an OVA so it is released very slowly, but it is very funny.

Recently ended:
Magical Pokan - I really enjoyed this series and there is hardly a serious moment in the series. AniDB link
High School Girls - raunchy version of Azumanga Diaoh (in a way). Good cast, and pretty funny. AniDB link