One other minor complaint I have is that each time you launch Calaboration, you have to enter your Google Calendar email address and password. Although, to be fair, I suppose most people won't be adding new Google Calendars to iCal frequently, and if they are, they're just as likely to be adding calendars from different Google Calendar accounts.

It's also worth noting that Google Calendar's iCal integration itself isn't yet perfect; I've experienced a number of minor issues, such as an inability to remove Google calendars from iCal. But I can't blame these issues on Calaboration, which does exactly what it's supposed to do and is very easy to use. Kudos to Google for creating this useful utility.