Released Date::ICal 1.61 last night. It is pretty cool, with things like overloading on - so that you can do
$duration = $date1 - $date2;
And there are some much more efficient internal algorithms, and a new class, Date::ICal::Duration, written by srl.
Get a new copy as soon as your CPAN mirror replicates.
In other news, I'm *almost* done with my book (http://www.apacheadmin.com/) which will be a happy happy day.