A few spells that likely could use some boosts to better match the PHB, as well as some balancing issues for others.
Ray of Enfeeblement - Change the duration to min/level, Its currently at 1/round level, which is pretty much useless.
Blindness / deafness - Change the duration to min/level, or Permanent as phb, Its currently at 1/round level as well.
Feeblemind - At least min/level, if not permanent, It currently very low duration and isn't much use at all unless your using it on low-save wizards.
Polymorph - Probably too hard to implement, but shamelessly giving it another mention for more/better themed forms.
Summon Creature - Another shameless mention, seeking more Ravenloft themed / varied results.
Bestow Curse - Heres one I've actually been putting alot of thought into.. I think there is a huge potential for this spell to make it alot more interesting.. Heres just a few ideas I put together. I'm anxious to see what others think of this sort of thing.
Curse of Retort
Silence - Permanent
Curse of Slumber
Sleep - Permanent or Hour / 3 Levels
Curse of the Mind
-4 Wis/Int - Permanent
Curse of the Body
-4 Str/Dex - Permanent
Curse of Rot
-4 Con/Cha - Permanent
Curse (default)
-2 All Stats - Permanent