I just tagged version 1.6 of the ical-events plugin, with a minor formatting fix and a fix for Google Calendar URLs. The caching code didn’t always generate a unique filename, depending on the URL.
You can download a zip file from Owen Winkler’s site.
Phew, been really busy recently. A few people have provided patches or suggestions for the http-authentication plugin, but I haven’t had the time to really respond to them in any useful fashion. Sorry if you’re one of these people. 
With all the buzz about Google Calendar I’ve gotten a few questions about the ical-events plugin. I had been sitting on a new version, with basic support for repeating events, for almost six months.
The plugin now includes support for event URLs, since it was a really quick fix.
This version is tagged as version 1.5. You should be able to download it shortly.
If you are using 1.4 or earlier, please note the API change described on the plugin page.