syncing music between computer and smart phone

[Stephanie Kvam]

I just bought a Droid X smart phone from Verizon and now I would like
to sync the mp3's on my computer to my phone. The software that was
recommended to me was DoubleTwist (http://www.doubletwist.com/)
Unfortunately, DoubleTwist is only guaranteed to work on Windows XP,
Vista, and 7. I tried to run it on my laptop (which is running Ubuntu)
using Wine, but to no avail.

So, my question is, can anyone recommend a nice user-friendly bit of
software that will allow me to sync my mp3's between my computer and
my phone? Or a way to get DoubleTwist to work using Ubuntu?

Thanks,
Stephanie