mount your Droid VIA usb, then open it on your computer just like its a flash drive. Make a new folder called "Music" (without the quotes) then copy and paste any music that you want into this folder. Viola
....although sometimes, it's tough to fix a bunch of mp3s (read: over 1,500 files) that have potentially screwed up or missing ID3 tags and no album art! :redface: *sigh*....it's a never ending chore to fix my mp3 files! :redface:
Go to the market and purchase ISyncr, plug the phone into your PC via the USB cable. Mount it. Run the iSyncr.exe located on your SD Card (One you run the app via your droid, it will place the exe on your sd card). After you run the .exe file click on the playlists you want to import from iTunes, click sync. Done. All of the music in those playlists will be copied to your droid. Just open your fav music player and load the playlist.