I can trawl through the new Apple App Store for hours. What I love about it is that there are all sorts of tricks on my Mac that I'd never even considered. Take this bizarre app for instance. Why bother checking your Facebook online, when it can be your transparent auto-updating desktop background? It'll even let you chat on it. Oh yeah, it's clever stuff.
I half think why, but then I think, why not?! It gives you one reason to keep that desktop tidy and makes that Facebook addiction a tad bit closer.