Sorcerers and spellbooks.

[Schiffer]

Anything we can do with a spell book?

[Tiny Coffee Golem]

Nope.

[Jeraa]

Schiffer wrote:

Anything we can do with a spell book?

You can throw it at people. Use it as a door stop. Maybe a tiny step stool.

Assuming you don't have a wizard in the party, the only thing you can really do with it is sell it.

[graystone]

Use both hands and hit someone with it overhand?
Start a fire?
Skip it across a body of water?
Prop up the short leg of a table?
Paper airplanes?
Origami?
Paperweight?

[The Beardinator]

You don't need it. Trade it to the party wizard for favors. Or sell it to a newly apprenticed wizard and get him in trouble with his master.

[graystone]

Oh, you could multiclass into a wizard!

[Jeff Merola]

There's actually something you can do with it, but it requires another item. Using a Mnemonic Vestment you can cast one of the spells from the spellbook each day as if you knew the spell yourself (it still has to be a spell you could learn yourself, so no using it on Wizard only spells, or other strange things that might have been added due to an archetype or whatever).

[Vutava]

My sorcerer used one as a notebook before I got Ultimate Equipment.

[Corvino]

You could always use it as a distraction. Pretend you're a Wizard, always consult your spellbook while casting and let people know the spell book is the source of all your power. Get a pet cat and say it's your familiar.

At some point, hopefully your GM will have some foe go to great lengths to steal the spellbook. If this happens, laugh maniacally and deliver exposition before exacting revenge.

[Jaxom Dragonheart]

Besides using a Mnemonic Vestment there's also the feat Versatile Spontaneity that allows you to prepare one spell a day from a scroll or spellbook.

[Kahel Stormbender]

I've had a sorcerer who used a spellbook and spell inscription quality inks as an encoded cook book. Since I was the party's cook (only one with any sort of cooking skills) I'd 'study' my spellbook for an hour or two every morning as I decided what to make at meal times that day. Party thought I was a remarkably talented wizard who just hadn't found too many spells yet. Badguys often assumed I was a wizard.

And when we got captured by an evil wizard after a long drawn out mage duel that completely exhausted my spells per day, said wizard took my spellbook since I'd used several powerful spells he didn't know. Then locked us in a room which was sealed by a wooden door enchanted to be opened only by the evil wizard, and immune to all but magic fire.

One burning hands spell later, and the party was going "Wha?! How? I don't... What?!" The evil wizard wasn't much better. We caught up to him again as he was struggling to decode... a recipe for braised fish. He thought it was a Disintegrate spell or something.