Let's see.
Suzumiya Haruhi no Yuuutsu (Melancholy of Haruhi Suzumiya)
It's different...I'll just say that.
Clannad
It's a fullout drama so...it's funny at one point an then make you cry. Fu-chan.
Lucky Star
If you just want random little jokes and whatnot after another. the show has no plot but meh. It's pretty funny and the theme will get stuck in your head. Plus it has tons of anime references and whatnot.
Jigoku Shoujo (Hell Girl)
Kinda...creepy how it shows the realism of human beings and their hatred, betrayal, etc. It's a really good one. Watch both series
And right now...I'm watching
Shakugan no Shana (I'd give you the English translation but I don't know what shakugan is or if it should even be translated...Shana's Shakugan? ah well.)
This one is strange, interesting, a bit scary, and...pretty. <<' Like really pretty.
Along with Shana, I watched a bit of
Vampire Princess Miyu and
Zero no Tsukaima. Miyu's a bit old but it's still enjoyable.
Zero no Tsukaima is a comedy and...well, it reminds me of Harry Potter except everybody is horny and the main character isn't 'omg amazing!' and blows everything up. For that one, you pretty much have to watch it. It's pretty good for what it is. .-.
If you're looking for a violent comedy,
Bokusatsu Tenshi Dokuro-chan (Club-to-death Angel Dokuro-chan) is well...perfect for that. ._.'
YouTube - Bokusatsu Tenshi Dokuro-chan OP Just watch the opening... <<' It's amazingly hilarious to me.