Hey, here is another option i just found..
http://freewareppc.com/clock/calendarforpokep.shtml
says you can increase the font and month view, but not sure if you can get it to display on the whole today screen... it does look like it shows certain appointments, judging by the colors on certain days though.
here's what i saw in the changelog that might interest you:
- Added 'Range' option (1 month, 2months, or 3months).
- Added 'Font size' option (Size 5, 6, 7, or 
.
- Added 'Alignment' option (Left, Center, or Right).