I have an iTrip FM transmitter than I use with an iPod all the time. HOWEVER, while it works great in my car it barely works at all in my fiancee's car. We live in an urban area and it is virtually impossible to find free stations to set it to... so be wary of that, depending on where you live. Works really great with my home stereo system, too. Highly, highly recommended.
Here are some newer, completely different conga lines to check out if anyone is interested. They have between 1-5 people in line for each, and a unique feature of these 4 conga lines is that you may sign up for using a referral from one line, but request to be placed in a different conga line if you already have an established account that you'd prefer to put in line. For example, sign up for the new freehandbags site using a referral from the conga site, but have your older freeipods account added to the freeipods conga line. Everything is explained at the sites below:
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(the FreeFlatscreens conga)