Smugleaf's White Forest

Mon Cole Knights! Or Tiger and Bunny

@Karamazov - I never got to watching that one, I'll check it out. Thanks! :D

YES, watch Tiger and Bunny.

Also, Michiko to Hatchin is a good series.

Princess TuTu

Ouran High School Host Club

Monster (but it's like 70+ episodes XP)

I didn't like it too much, but it also wasn't that horrible...Baka to Test is interesting to say the least.

Me, too. I need something new to watch... but obviously, Tiger and Bunny IS an awesome anime and I recommend it to the last episode XDD

Let's see... Have you seen Death Note? It's totally ADDICTIVE and thrilling - you might find yourself staying up all night watching the episodes.
(at least I did)

IMO, C ~ The Money and Soul of Possiblity Control was also okay. It's a financial anime, but you might find it interesting if you like economics and money.

What else... Rozen Maiden - It's a good story about dolls. It's not about harem or moe - but the dolls have their own sad stories to cover.

Uta no Prince Sama - based on an otome game - but it's well-made in high quality. But maybe guys won't like this kind of genre.

Kuroshitsuji (The Black Butler) - The first season was brilliant.

@Tsutarja How short is short?

Chrono Crusade
Cowboy Bebop (It also has a movie.)
D.N.Angel
Elfen Lied
FLCL
Gankutsuou
Please Teacher!
Please Twins!
Ouran High School Host Club
Paranoia Agent
Scrapped Princess
Wolf's Rain

All are 26 episodes or less. Ignore that I'm old and haven't kept up with much recent anime like the rest of these youngsters. :B