YouTube Downloader: iTube

Hi Guys,
We've developed great background youtube player which saves automatically every song played.
Features:
- Connect with your YouTube account and manage playlists directly like on site
- Find Lyrics for videos
- History & Favories playlists
- Full screen mode on horizontal
- Related videos on end of a song

Please find the APK on our site on itubeandroid com or attached as file

Also, we've an advertising budget for this software.
Any ideas where should to put effective advertisements? We seek for off market portals or popular off market realted software. I'll welcome any ideas for this as well.