If you wanna have some cool action :
Mobile Suit Gundam OO
Tengen Toppa Gurren-Lagann* (a must watch if you're into Super Robots stuff
Heroic Age
Claymore
MACROSS Zero
The King of Braves: Gaogaigar THE FINAL
New GETTER ROBO
Vandread & Vandread the Second Stage
Mazinkaiser
MACROSS FRONTIER ( Epi 1 PROMO out already, the whole series is due out in April)
Top wo Nerae! Diebuster
Kaze no Stigma
and etc. (coz too much already cant list 'em all out ^_^')
Funny/romance and school-theme :
School Rumble
Shuffle!
Elfen Lied
Otome wa Boku ni Koishiteru
Zero no Tsukaima
Seto no Hanayome
Lucky Star
Full Metal Panic series
Rosario+Vampire ( just started this year!!! XP)
These are some that I've watched/ going to watch that are of good remarks.
Hope it'll be of some help to you :P