Is it possible to change the shading of the selected day/today/weekend in iCal?
The light blue tone which is used to mark the current Day is almost impossible to recognise. Same Problem different color on the highlighted days.
This question has been asked on the Internet before, and no one has ever found an answer.
The 'fixes' that have been suggested are all just to improve your computer screen's contrast.
Sorry there isn't a better way to do this.