AlternativeTo is a new approach to finding good software. Tell AlternativeTo what application you want to replace and it will give you suggestions on great alternatives! Instead of listing thousands of more or less crappy applications in a category, AlternativeTo make each application into a category. Think of it like forever evolving blog posts about good alternatives to the software that you're not satisfied with. And the "blog posts" are generated by you through suggestions, comments and votes.
Of course this is nothing more than a alternative for LinuxAppFinder.com