Because Wil Shipley said (http://twitter.com/wilshipley/status/3350641174):
Know what I'd like? If iCal actually called attention to the current day somehow. Seriously, light blue for current, light gray for sel?
and (http://twitter.com/wilshipley/status/3351193716):
Fun iCal game: Look at your LCD screen from 30° above, and watch the highlights for the "current day" and "selected day" totally disappear.
- iCal 3.0.8
- SIMBL
xcodebuild install
defaults write com.apple.iCal TodayColor 00ff00
defaults write com.apple.iCal SelectedDayColor ffff00