Not in a particular order but I would like to see:
Angel beats - already watching it on demand and I love it. Such a good show.
Fairy tail - Haven't seen it yet but I've heard its good and it could probably run really well on toonami.
Blue exorcist - reading the manga but if the anime got dubbed then hell yeah. I would love it see it on there.
Baka and test - Just something hilarious and cute that I would like to see on there.
Thats all thats on my mind right now. I hope we'll see some more really good shows on there.