I'm a native Dvorak typist, never touch typed with QWERTY. Just have to hunt and peck when I'm on a non-Dvorak keyboard. Makes some things painful (like the GRE test, ugh), but most of the time it's fine. If I have to do real work on the computer you can switch it to Dvorak in ~2 minutes, Mac or PC.
That said, I much prefer QWERTY on my blackberry/iphone/xbox/etc because I have no idea what Dvorak actually *looks* like. I can touch type with it, sure, but I still see QWERTY keyboards 100 times a day. Never seen an actual Dvorak keyboard, it still looks strange when I see the layout. That makes the QWERTY layout much better suited to thumb-typing.
I guess I'm bilingual.