Well, it can sometimes take a while for your application to show up in the Application Manager. So if you are successful in using dput, but unsuccessful in viewing the package in the repos in a web browser, that doesn't mean that you haven't uploaded your package successfully.

Wait a few hours, and then try to find your package in Application Manger (make sure you have the extras-devel repos enabled of course). If you don't see your package, fire off an email to Niels Breet, maemo.org's webmaster, who can help you find what is wrong.