It takes a lot of courage to put an app on the App Store these days, as more and more developers have their works rejected for various stated or unstated reasons. This time, it was Angelo DiNardi’s turn to see his MailWrangler tuned down, for duplication reasons. That sounds familiar, doesn’t it?

Last week, Apple told developer Alex Sokirynsky that his app – Podcaster - has been rejected because it duplicates the functionality of the Podcast section of the iTunes. However, the problem seems to be much deeper, as Podcaster in fact offers much more than Apple, with more functionality than Apple’s own app.

Most recently, it was DiNardi’s turn to see his app rejected because it “duplicates the functionality of the built-in iPhone application Mail without providing sufficient differentiation or added functionality, which will lead to user confusion.”

The developer’s reaction was similar to that of Sokirynsky, in the sense that they were both surprised to see Apple’s response. “This is an interesting claim,” said DiNardi, “since although handing email, my app is simply directly loading and showing Gmail inside of an application. How can you confuse Gmail with Mail.app I’m not sure.”

These are just two of the many cases of rejection from Apple, and as the number of confused or angry developers grows, alternatives always show up. According to PC Magazine, there’s a new place for rejected, but very useful iPhone, iPod apps called Apptism, a website where users can purchase and download apps with no limits. Users can choose from over 3,700 apps, they can read user reviews, and see the most popular downloads.