I have a fairly new phone, the Sony Ericsson w580i and I think it is a neat little thing.
I've been using it as a usb-storage device at home under Linux without any problems, and I've pretty much filled my extra 4GB M2 card with music from my collection.
Today I decided to try to get a picture from my phone to my work PC (which is running... eh, Windows XP) and guess if I'm up to a shock: it doesn't talk to the phone. It claims it can't find any drivers for it and for some reason it doesn't just go for usb-storage (even though we know now that it is OHCI compatible - at least).
Crap. On the Sony Ericsson site they offer the Sony Ericsson PC Suite 2.10.38 (for Windows Vista/XP) which is a whopping 44.8 megabytes! And all I want is to access my phone as UMS. Grrrr.
Once installed, I can access the phone fine but now I get that bonus popup annoyance windows that repeatedly asks me if I want to reboot the computer so that the new stuff can take effect...