Existing users, 
Now that Google Calendar supports CalDAV - a calendar sharing protocol that iCal supports out of the box - these sorts of programs are probably unnecessary for most people. You can just use iCal to directly access your Google calendar, including adding, modifying, and deleting events.
Take a look at Google's how-to regarding setting up iCal for use with Google Calendar.
Probably unnecessary - afterhours
It does a lot more than just feed Google your data. Syncing between Macs on a LAN is a powerful management tool in our business model. Knowing where staff are, client contacts occur, notifications (which, in our experience, work flawlessly), and organizing our various workloads really have become essential. This product replaced Now Up To Date, doesn't require a server, and is simple to set up and configure.We don't use Google. We don't want our data exposed to Google. I suppose if we were to need an 'anywhere' calendar without sufficient privacy or security concerns, Google would be one of the considerations. But for a simple peer-to-peer (to peer x3 more, as we have 5 systems that need to be sync'd), this product consumes very little bandwidth and has functioned exceptionally well with the 10 calendars we run.
YMMV.
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Monday, October 20 2008 @ 08:24 AM PDT