+1 for this one (sorry, at first I didn't see the votes box)
This issue is related to the draw_white_space setting (esp. when set to "all"). Whitespace chars are currently drawn using too heavy colors.
Other people want it too: http://www.sublimetext.com/forum/viewtopic.php?f=3&t=2754
Служба підтримки клієнтів працює на UserEcho