conditioning for forearms and hand grip

[niqaeli]

I could probably google this, but I figured I'd ask around here first!

For reasons that are not actually immediately climbing-related (though I do want to get more into climbing at a point where I can afford to tear my hands up), I'm in desperate need of conditioning exercises for forearms and hand grip. And I could not think of anyone who would know such conditioining exercise *better* than climbers. (All other athletic endeavours I've been into before didn't particularly value strength in those areas.)

So! What are your favourite ones? Is there any equipment you find particularly useful?