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Now I've finally got something to tell the players when they say "I search the wizard's library"!
Hey, I've got a cool idea: what if studying some of the tomes gave the possibility to learn exotic spells or weird metamagic feats? Not for free, I mean, but when the character gains a new feat or new spell (if he's a sorc), he may choose one of those from the books. It would be a nifty way of introducing new stuff to the game. The rarest of them might even contain the lore needed to enter some prestige class (new or from T&B or whatever other source).