Google just made the lives of third-party calendar developers much easier. Rather than having to constantly poll Google Calendar servers for updates, the Calendar API now supports push notifications.

In this helpful how-to, columnist Russell Savage explains how to integrate Google Calendar with AdWords to monitor your campaign start and end dates.

Instead of trying to set up everything manually in a cron job, he created a short and easy-to-modify JavaScript script to keep track of events on a Google Calendar.

One Calendar is an API that wraps around commonly used calendars, such as Google Calendar and Microsoft Exchange, and was developed by the team behind the One Diary app.

Google Calendar task list feature I decided to spend a little time today digging through the Google Calendar javascript source and I found a couple of things I thought were interesting.

Google looks like it's rethinking how Calendar on Android shares your data with other apps.