just wanted to report that i was able to browse the filesystem and microSD card in my Telus Motorola V750 with bluetooth using "out of the box" Ubuntu 10.04 (Lucid Lynx).
this is new in Ubuntu 10.04, as i have not been able to do this with previous versions of ubuntu and this phone (my k1m worked ok with Intrepid Ibex). i have not tried bitpim or any of the other available linux phone tools, but i was able browse my music, photos, and videos and copy them over to my computer. i was also able to push an mp3 file over from my computer to the phone where i was able to listen to it.
so just a heads up if you are interested in trying this. I am happy to not have to pop the sd card out to transfer photos anymore.