Until today I was really happy with the Android Market. But until now I just was a user of the Android Market. But what happened?
Today I opened a developer account for the Android Market. My plan was to offer a small little app in two versions: Free and paid. It's quite common in the Android Market and I have seen something like this many times in the Market.
I really wished that the Market had something similar to Handango where you can upload a free "demo" version and the "full version" that a paying customer gets together. Unfortunately this isn't possible!
And even worse: You even cannot have two apps that use the same name space. (the package attribute of the Manifest file). That means you cannot easily create a free and a paid version from the same code base.
There are already some ideas how to work around this but all of them are less than ideal.
See http://stackoverflow.com/questions/1222302/android-multiple-custom-versions-of-the-same-app and http://droidin.net/2009/05/13/android-multiapp/ for more about that.