AppsGoneFree is an app that shows you free apps available for the iPad/iPhone. This one is, in my opinion, more useful because it lists them by date. If you missed yesterdays announced apps, you can change the date and it will tell you what the discussed on a previous day.
Another note, I just posted about AppGratis yesterday. I had posted it a few months ago. It was an app at one time but that feature is no longer available. You can still get their daily updates by subscribing to the daily email. I failed to mention that in the latest post.