Do you own a LG Dare and a MacBook with iTunes? How do you send files across?

My gf got an LG Dare, which is now equipped with an 8 GB micro sd. I’m trying to get music on it and researching discussion boards. I managed to get music onto the phone memory via bluetooth, but haven’t figured out how to get it onto micro sd memory without tripping duplicate files and the like.

Do you have a method? Should I just download Bit Pim?

I’m running Tiger, but expect to upgrade to Leopard in the next month or so, if that makes a difference.