10.7: Change iCal font size
I was thinking Command+ or Command- might zoom in or out like Safari or Mail but found the it behaves differently in iCal.
In iCal Command + or - changes the font size on displayed calendars. [crarko adds: This is new in iCal 5. It's shown in the iCal View menu as 'Make Text Bigger' (or Smaller).]
Source: http://feeds.macosxhints.com/click.phdo?i=eaf13699a65b99aadffe6c74670dee00