Distimo has announced that it has upgraded its App Trends service allowing free
searches for an entire month’s worth of data for any app. The search results are for most major markets too including iOS, Android, Amazon, BlackBerry, and Windows.
App Trends allows developers and publishers to visually analyze the app market by examining daily download, revenue, and rankings trends for any app. It's pretty handy to with the extension of their free searches you can get a good snapshot of version releases along with associated dates and total download counts. You can also use it to spy on competitors or just to be nosey (which is rather shocking when you see how many downloads some apps are getting!)
App Trends also provides an auto-complete search function, a sort by country filter, a mobile-optimized site, actual ranking figures and more.