[hendrik-xdest]

I tried your app and liked it. But there is no way to get in contact with you easily. Try to offer a simple contact form to send in feedback. And - I can't believe I am saying that - make it visibly beta.

Because I would really like to use grapevin but have run into some technical problems. First, if I add a track I do not get any feedback of it's addition when using the latest non-beta Firefox. Secondly, if I click a song from the "Edit Playlist" page it will always play the first one and not the one I clicked. Before you do any extensions test your app extensivly. It will help spread the word when more user are satisfied with the service.

The next step in my opinion would be to include more music sources, of course. There is already a lot that is recognized. You might want to consider displaying a different "Missing cover" grafic when the song is available from Grooveshark, though. For example "Das Racist - You Oughta Know" does not show a cover but has the song. While when putting in an unknown German band it displayed the same icon. One always has to check his live page if a song can be played or not.

In my opinion, if you get the feedback function up and do not have any financial targets, it's best to let it grow on it's own.