This needs some clarification. Mewseek Pro does not use P2P, it uses Seeqpod API so its the same thing you can get with dTunes.
Mewseek(original version) is based off Soulseek, the P2P application, and it downloads and works well, except that you can't import it into your iTunes directly. You either have to play the songs with PwnPlayer or SSH them off and import them into iTunes desktop to get them to your iPod.
If someone knows a way to import songs into the iPod directly from the phone, please let me know. There is obviously a way since Mewseek Pro does it.
Also Mewseek is free, Mewseek Pro is $6.99...