This is too awesome. Simplify Media lets you access your iTunes library over the Internets, and even stream it to your friends. So you can listen to your favorite music from work or wherever you are. Plus, it's free.

Simplify Media is available for Mac, Linux, PC and iPhone.

Get Simplify Media for your computer

Get Simplify Media for your iPhone

Any app that streams music to my phone is cool. Any app that does it as well as Last.fm's native iPhone app is super-ultra-cool. This one is kinda like Pandora's iPhone app, but taps into your Last.fm/Audioscrobbler profile to give you music that's similar to the stuff you already listen to on your computer with iTunes.

Get Last.fm

Pandora radio almost makes mp3s obsolete. Thanks to the Music Genome Project, Pandora lets you make and train personalized internet radio stations that are catered to your taste, and recommends related music based on what it knows you like. You can even listen to stations created and shared by your friends.

With the Pandora iPhone app, you can access all the stations you already created at Pandora.com, and you can stream unlimited music to your iPhone or iTouch. Well, unlimited until your battery runs out.

Note: If Pandora gets shut down before you have a chance to enjoy this app, be sure to check out the iPhone streaming music player from Last.fm. It does a lot of the same thing, and looks like it might be around for a bit longer.

Get Pandora