They make very clever software for organising meetings. Simply CC in their robot (Amy or Andrew, depending on your preference) and their robot will extract out vague time specifications from your emails and then start an email exchange with everyone else the email was sent to. Eventually you get a meeting entry created in your calendar.
Customers with Google Apps should make this a mandatory sign-up for all their senior staff as it saves hours per month on tedious to-and-fro work that can be automated.
Greg Baker is an independent consultant who happens to do a lot of work on HP DataProtector. He is the author of the only published books on HP Data Protector (http://www.ifost.org.au/press/#dp). He works with HP and HP partner companies to solve the hardest big-data problems (especially around backup). See more at IFOST's DataProtector pages at http://www.ifost.org.au/dataprotector