I just wanted to point you to a site similar to appnr that we launched not long ago, it's called allmyapps.com... The goal is to provide people with absolutely no Linux knowledge with a tool that will help them search and install new applications. This is why we try to focus as much as possible on usability! Besides that, It is also a fun way to explore the Ubuntu repositories :) In case you're interested, I'd be happy to have your feedback! Thanks!