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Rachel from CloudGizmos here, the makers of The Scoop Composer. For those interested, here is a more in-depth look at the features of our latest Google Apps Salesforce integration: http://techcrunch.com/2008/04/07/rumor-salesforce-to-resell-google-apps/
and a short video for if you've only got 2 minutes to spare: http://www.cloudgizmos.com/salesforce-gmail-integration/contextual-salesforce-gmail-integration
In summation, our solution is perfect for security-aware enterprise companies (like Google - our first customer). Thanks for your time, and I hope this was helpful. - Rachel from CloudGizmos
As was already mentioned, one potentially easy way I've heard about to synch up Salesforce and Google Apps is offered by companionlink.com. I've used Salesforce CRM, but not the Companionlink software, so you might want to look around for some reviews or user experiences. While Companionlink has been around for a while, I think their Salesforce application is fairly new, so there might not be a lot of reviews yet. You might want to go to the Saleforce AppExchange, www.appexchange.salesforce.com, and poke around to see if there are other options that could fit your needs. There are literally hundreds of apps that integrate with Salesforce on there, some at no cost, so it could be worth a shot.