Here’s a better way to find what exactly you are after on the net, using Google and a decent social bookmarking site (like digg.com).
Let’s say you are after a backup utility for firefox. Yes I know you could go and look through the Mozilla plugin pages, but you want to find something that is good (ie tested by many others).
in Google, type in site:digg.com “firefox backup”
The first result (especially in this example) is normally the best. And even more so with digg.com because it would of been ‘dugg’ by a lot of users. Try it yourself!