I’m already a big fan of the iConcertCal that Josh wrote about a couple months ago– it allows users to see all of the relevant upcoming shows in their area with a mere keystroke in iTunes. Icelander Hjalti Jakobsson recently launched another iTunes-integrated application that has been resonating well with devout music (mp3) blog readers and music downloaders. Peel’s functionality is twofold. You can (1) subscribe to and browse your favorite music blogs within its iTunes-esque interface, and can (2) stream tracks or one-click download mp3’s from Peel into iTunes. Peel is currently in beta 2 and is available for free for Mac only. When Hjalti works all of the bugs out, he’s going to try to roll out a PC version as well, and will at that point begin to charge a nominal download fee. More on Peel here.