Some ideas are so bad, it makes me happy that none of you are actual devs. Most of them just copy/immitate existing spells, come on, can't you come up with your own ideas?

ot:

Disc:
*no idea :-(

Holy:
* give spirit of redemtion some uniqe abilitys, maybe a raidwide renew or coh, maybe 100% haste. Just give it something better then no mana costs and beeing a target for /lol /bye

Shadow:
* mind sear castable on every target (incl. friendly) would offer some nice possibilitys (as someone hase mentioned)
* make mind control a non channeled spell with a cd, maybe like hex.