lchiu7: Maybe it's different on the N1 but all I do is connect the phone to the PC, turn on the USB drive and access files on the phone using Windows Explorer. That doesn't seem too hard for me.
I think it varies by phone - Samsungs (at least my Galaxy Spica) seem to make this difficult/impossible via the supplied connection software. My new phone (ZTE Blade) behaves exactly like your N1 - plug it in to USB, press one dialog button on phone, and it behaves like a USB drive on the PC