Thank you for this great plugin.
I have edited the code of your plugin a bit, to have it display the large calendar correct (and more neatly) on both Explorer and Firefox.
In the file [cal-funtions.php] on line 39 (on top of my head) I changed the line:
$calContent = '<table class="ics-calendar-table" cellspacing="1" cellpadding="0" width="100%">';
to:
$calContent = '<table class="ics-calendar-table" cellspacing="1" cellpadding="1" width="100%">';
This makes the calender more readable and it solves the double border problem at the right side of the calendar block in Firefox.
One more thing, how far are you along with adding/editing/deleting events in the WordPress configuration (calendar *new) item?
I would love to use an internal editor, as my calendar will not be shared.