I agree with those who said Ghost Hunt. It would be so easy to make a second season as there isn't a strong base storyline... I think they could take it so much further and add in some character development... We know so little about the characters
Inuyasha's ending was terrible. After 167 episodes I thought the ending would at least be good. It at least deserves an OVA or movie to wrap everything up.
I started the manga awhile ago to see the real ending, but I got bored after it got to the Mt. Hakurei arc :(
Fruits Basket is another one, of course, and Elfen Lied.
Since I recently finished Hidamari Sketch x365, another season of Hidamari Sketch would be splendid. But then again, I have no idea how much more manga material the producers have to work with, so I can wait if they decide to do another season.
Defiance said: When I think about it, it would be really nice for REC to get a new full fledged season.
I agree, that would be good as.
Also... DearS could do with another season, since the other one
ended without anything happening really...it was kind of anti-climactic I thought
Detroit Metal City because it's awesome and was too short. Full Metal Panic since there was still a lot of unexplained shit at the end of TSR. GTO because it's awesome. Banner of the Stars because see above.
Oh and of course Mars of Destruction because I want more *rolls eyes*
-Claymore(but first an OVA that corrects the crappy ending)
-A Gundam with middle-aged main character or a new one in CE era(but a new UC series would be good too)
-Shakugan No Shana
-Darker than BLACK
-Full Metal Panic
-Kaze no Stigma
-Maburaho(funny to see what kind of thing will do 100 Kazuki:P)
-Elfen Lied(the manga has ended already...it's only needs animation)
-Strait Jacket(who not knows:[url=http://myanimelist.net/anime/3086/Strait_Jacket]http://myanimelist.net/anime/3086/Strait_Jacket
-Melancholy of Suzumya Haruhi