Ical2rss

iCalendar is a standard that is (too) slowly gaining popularity.

ical2rss is a simple script that converts an iCalendar-feed to an RSS feed of 'upcoming events'.

[edit] TODO

consider character encoding issues (is iCalendar always ISO-8859-1? Then we could simply use utf8_encode when printing data to have UTF-8 RSS output)
use <pubDate> elements for dates