Ok, this is hardly the latest technology, but I've just finally got around to unblocking the Sony-Ericsson P800 I bought off my brother a good year or more ago and actually started to use it, and it's bloody good.
I've got the desktop cradle thing plugged into the USB port, and the phone in the cradle, and I've just realised that you can get directly into the folder structure of the phone's memory and the additional memory stick.
But it won't let me do the simple action of dragging and dropping files into a another folder, situated on my hard drive.
WHY? Goddammit!!