I seem to remember seeing rules in the DMG (it was in 3.0, and probably is in 3.5, too) covering the chance that a magic item would have some marking/inscription/whatever that would give PCs a clue about what its function was. I also remember something in the crafting rules that gave the creator the option of having an item identify itself to its wearer/user. And yet, I cannot for the life of me ever remember seeing anything like those rules actually be used in a game. Strange, huh?
Skimming quickly through my 3.0 DMG, I see a bit here on identifying magic items that says "You might also permit a character to attempt a Spellcraft or Knowledge (arcana) check (DC30) to determine if she can attune herself with the item's power or if she remembers reading of it once in her studies," so the door is clearly open for GMs to not force PCs to crave 100gp pearls constantly.
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which ought to make all those poor stressed-out oysters happy
ryan