MP3 Cat is an easy to use database for the MP3 music files (supports most MP3, WMA, Ogg Vorbis, and Monkey's Audio.) With MP3Cat you could group your MP3's by album, artist, genre, tag or even organize tracks by keywords. The interface is very similar to iTunes except that it also integrates with Windows Live Writer. With the Windows interface, the whole procedure of drag and drop would be automatically synchronized to the iPhone or iPad. For this you need to download the free version of MP3 Cat from the official site, install it and follow the prompts.
As this app is based on the iTunes technology, it could be utilized in any iPhone or iPad, iPod Touch or iPhone. This application is not compatible with the currently released Windows Mobile 5. You could also synchronize your iPhone or iPad with a Windows Mobile Phone using this app.
Since it is written in C#, it could be utilized with various programs. Although the list of programs that could work with it is quite short, you should not worry because there are free versions of the applications. You could simply download these and try them out to determine which one would work best for you. However, if you would like to experience a faster and more error-free synchronization, then you could opt to buy the full version of MP3 Cat.