Some of you may already be aware of the website appshopper.com. For those who aren't, it is a website which keeps track of (all?) new apps in the Apple app store, as well as price changes to existing apps. I find it particularly useful to see which paid apps are currently free for a short period of time!
Well they have just released an iPhone/iPad app which gives you all the same app goodness, but in a more convenient app. Totally recommend checking this free app out. Could save you hundreds!