Don,
It looks great to me. I'm using IE 6.1.
I did notice this little blurb about calendar issues on the Calendar.net website:
Note for Opera and Mac
If you cannot access a calendar at the usual URL (my.calendars.net/nameofcalender), try adding "www" to the beginning of the address, so that it reads:
http://www.my.calendars.net/nameofcalendar