I've just been looking for a Pathfinder Bestiary/Monster database/spreadsheet and couldn't find anything online. Did you manage to build anything like this in the end?
I know d20pfsrd.com has all the monsters, but its not exactly a database/spreadsheet app.
I'm a web developer and programmer and would be interested in building something like this. Drop me an email to me@adamwintle.com if you ant to discuss the idea :)