Honestly, I didn't use iCal feeds very much before I started writing this plugin... I had started using the Event Calendar 3 plugin but didn't like having to enter all my events yet again... Most of my personal events were already in my Google Calendar and I had used iCal feeds in a minimal way while playing with Google Calendar (mostly adding the Bugzilla and Detroit Lions schedules to my calendar). So I decided to see if there was a way to use that existing information in a sidebar on my blog. And the Upcoming Events plugin was born :).