Usually, you get hammered over the head
You also see the standard, good spells that can be creatively abused into cheese or mega-cheese (Polymorph Any Object, Fabricate, Alter Self, etc.)
And then you also run across more esoteric, under-appreciated spells that really shine in the hands of a creative rules-mangler (Silent Image, Magic Jar, etc.)
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The purpose of this thread is to see if there are any more absolutely essential (and perhaps, abuseable) arcane spells out there that need to be spotlighted. The catch? The spells have to be from an official WotC D&D publication besides the PHB!
Meaning all spells are legal from the splat books, Forgotten Realms supplements (FRCS, MoF, Underdark, RoF), D&D/Wizards Web Site spells, and all the supplementary books like Savage Species, Miniature's Handbook, MotP, CW, Dracominocon, etc.
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Even if you wish to spotlight a spell that really has a narrow, but strong utility, feel free to pontificate. The reason for this thread is that the usage and rules-mongering of all the PHB spells has been discussed to death ... and the hundreds of other official D&D spells published seems to get little airplay. Yet there is a treasure trove of kick-ass spells out there that really need to see the light of day. So many in fact, even a straight-level Sorceror should have an absolute ton of spell selections to pick spells from and should squelch any kvetching about lack of sorcerly options.
I'll post some later tonight. Oh .... and please, let's limit it to arcane spells for the interim. Maybe we can do a divine spell angle later on.