I've been eager to try out the Programmer Dvorak keyboard layout, so I downloaded it from http://www.kaufmann.no/roland/dvorak/.
Strangely (to me at least), with it activated, I can't input anything into TextMate. TextMate is perfectly happy with the Dvorak options that come as standard with Snow Leopard, but this just shuts it down.
It seems ironic that a keyboard layout designed to maximize programming efficiency should be violently incompatible with an editor designed to do the same! How can I get TextMate to accept this new layout?
Hmm, curiously it seems to have started working now. Possibly I just needed to restart the computer?
In anycase I suspect this was a non-question - sorry!