Are you human?
Enter letters on image
ST2 build 2139 ("check for updates" says it's latest version); OSX 10.7.2.
I'm having the same problem on a MBP-retina.
OS X 10.8.1 (12B19)
SublimeText 2.0.1 build 2217
Exacty same thing happening to me with ST2 build 2219
Noticed that in 1920x1200 resolution. Higher resolutions make the keyboard repeat go faster (or is it the screen redraw?)
It's a mistery.