Exasperator is pretty good, but I think
Crime of the Century is probably even better for being a pure finger crack
The following a fairly hard ticks's but the climbing is amazing
Equinox (5.12c) in Joshua Tree. Absolutely beautiful line to slightly overhangfing fingers with technical feet to a jog to the left
http://www.summitpost.org/images/original/345533.jpgMutiny on the Bounty (5.12a) at Paradise Forks some people stem it but most of us campus between perfect finger locks.
Paradise Lost (5.12a) at Paradise Forks consisting of overhanging fingers in a dihedral.
Ruby's Cafe (5.13a) at Indian Creek tight fingers in a double corner change leading to a roof (if you are tall, its much harder then Micah made it look in "Return to Sender". A perfect finger crack (take 2 0.3 blue C4's and 8 0.4 Grey C4's) At an Easier grade in IC is
Johnny Cat (5.11d)
http://www.youtube.com/v/HcIuz6B1Qe8 which is a striking wide finger crack.
Annunaki (5.11d/5.12a) (
http://www.summitpost.org/images/original/460189.JPG )is also good (though it goes from hands to fingers) and don't be afraid of the grade since if you work out in a gym it actually climbs like its 5.11b. There is an even better more perfect finger crack there but until I get it all I'll say is that its hard (in the 5.13c/d range), but its a perfect finger crack.
As mentioned
Red Zinger (5.11d) in Yosemite
http://www.summitpost.org/images/original/281809.jpg is a good finger crack as is the crux pitch of the Rostrum (soft 5.11c)
http://www.summitpost.org/images/original/264446.JPG .
Due tgo the nature of perfect finger cracks they tend to have stratospheric grades, but a great finger crack at a more reasonable grade is
Gemini Cracks (5.9) on Hammer Dome At Calavaras Dome (in No California). Its gotta be one of my favorite 5.9's.