For those who have never taken off their door, what are you doing to transfer files on your memory card (if you don't have your USB cord handy)?
If I'm going to transfer one photo, or one word doc, or one mp3, I use Clip2Mobile.
Great program! You install a client program on your PC, install the app from the Market to your Droid. Now, you can simply launch Clip2Mobile on your PC. A window opens up, and you can drag files to that window for wireless transfer to your Android device.
Once you launch Clip2Mobile on your phone, any apps you dragged to the PC program will now be available for download to your Droid (or any Android device)
I use this for new backgrounds I've found on the web that I want to try on my phone, as well.
If I'm going to transfer an entire album of music, or 10-whatever # of photos (I'm into photography), then I do connect my Droid via USB to my PC. But, that isn't that often, and can always wait till I'm at my PC.
I only remove the batt door if I have to do a reset (has happened only once, in the six weeks I've had my Droid)