[fiestito]

I would say the blackberry OS its one of the things that I prefer among other phones.
I love the way you can manage the software that your phone runs, I mean that you can remove must of the things that aren't necessary for the device, and the way you interact with the phone and the pc through the miniUSB port (for charging and transferring data at the same time), Its so easy to install or remove new apps or perform an OS upgrade.
Also Im a GNU/Linux user, and with the lack of support RIM has for the linux platforms, its amazing how well you can handle the device with a Linux OS, like charging, moving data, and loading music.
I'm really happy with the blackberry user community, this forum its a great source of info, and thats an important key if you want to get the best of your device no matter what kind you have.