I have a droid x, and wondered if anyone has used a fm modulator with their phone? I wonder if all modulators are the same?
A lot of people do. I don't recommend them except as a last resort. Sound quality suffers and they're not very useful is cities with packed radio bands.
My work truck does not have a aux in or out, trying to find a way to listen to my music though.
You don't have much of a choice with a work truck though. You might want to check the Accessories subforum. There are existing threads on audio options and FM transmitters.
No tape desk either? Even a cassette adapter would be a better option.