Net-Google-Calendar
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1. Get your feed url as described here
http://code.google.com/apis/gdata/calendar.html#find_feed_url
2. Run
perl -Ilib bin/google-calendar <url> <user name> <password>
to list stuff and
perl -Ilib bin/google-calendar <url> <user name> <password> <title>
to add an event.
( run in 0.327 second using v1.01-cache-2.11-cpan-de7293f3b23 )