If you have been looking to remove DRM protection from iTunes music, look no further. The freeware named DVDneXtCOPY iTurns Free does this for free by converting your iTunes music library into DRM-free mp3 files!
iTurns Free works by stripping the DRM protection from audio purchased from iTunes music store. It installs a virtual CD burner on Windows (works on Windows only).
How to Remove iTunes DRM

Install iTurns Free
Select iTurns Free as the default burner in iTunes Settings
Click on iTurns Free icon in your task bar and choose where to store converted …

If your car doesn’t have an audio in jack, you are going to love this. A FM transmitter can broadcast your iPhone/iPod Touch music wirelessly to your FM car/home stereo. You just plug the FM transmitter into the dock connection and start playing your music.
AV Labs has a cool looking iPod Touch/iPhone FM transmitter. It lets you even adjust the FM frequency you are broadcasting on. It sports stereo quality sound and comes with a free car charger adaptor as well.
Buy.com has the AV Labs FM Transmitter for iPod/iPhone on …

Midomi is an awesome yet free iPhone music app. You can find songs by humming, singing or putting your iPhone near a speaker using Midomi. You can read the full Midomi iPhone app review here.
For a short period, you can get a free Midomi Microphone from Midomi. You have to do the following:

Download Midmomi mobile for free on your iPhone
Submit a review in iTunes for Midomi mobile
Email your iTunes nickname (not iTunes account name) to support@midomi.com with your mailing address.

We did it and after a week we were just notified …

With iRinger, you can create a ringtone for iPhone from any audio or video file. It is amazing at the number of audio and video formats

Simplify Media lets you stream your entire iTunes library to your iPhone or iPod Touch over Wi-fi or the 3G/EDGE GPRS network.

With Midomi iPhone App, you can sing, hum or whistle that tune and Midomi will search for that music and return all the information about that song