If you're looking at optimization apps, there's a bundle for sale for the next ~24 hours at http://appsumo.com/, where you can get Performable, CrazyEgg, Visual Website Optimizer, Clicky, and UserTesting for $25. They aren't full licenses, but you're still getting $500+ worth of apps for $25. If you only convert one new user because of the tools in the package, it'll have paid for itself.

I don't know of a centralized site where people talk about specific UX / funnel optimization apps, but would love to know of such a place.

check out some pointers at http://answers.getapp.com/Looking-Web-Analytics-software-ser...