MyTunes has been on the App Store for a little while. It's developed by SRS that uses that company's patented sound enhancement algorithms to make music sound "better." It's not completely clear what the algorithm does (as SRS wants to keep it secret), but basically, the tech boosts and lowers certain qualities in audio to make it clearer and more listenable.
MyTunes Pro is the new version of MyTunes. I saw it in action at CES earlier this year, and it's now available for the iPhone and the iPad (here's the HD version). The biggest update is that you can use Ai