I like my bluetooth as I have a wireless mouse and keyboard and I can send stuff to my mobile with no problem, it's backup my address book with no problems (instantly) and if I want to change my display/ring-tone etc then I just send it. Much easier than having to get out a data cable.
I don't think I've ever connected my phone to my PC. I just whip out the card and plug that in to the PC get the incriminating photos from it.....I have a Sony Eric K810 at the moment, so I'll probably swap to a K850 next month when I can upgrade.
Oooops. Off topic again!!!