Michael: I don't get any mouse lag, how did you solve it or was it never an issue? What timing method did you use: delta timing, fixed logic or just sync to a set refresh rate e.g. 60Hz (surely not)? Any other cool tips you'd care to pass on?
I used logic fixed at 100hz (mostly so the numbers are easy to work with). I was considering changing this with my next game, but I decided against it as it worked well enough in Inca.
Cool tip: work hard.