Google Apps "integration" with Salesforce has been out for a while. It's a great solution for many SME. However, I will say it still takes some more integration to get them work. Instead of associating the document with sales lead, I am expecting more way they work together. For example, maybe they can make Google Spreadsheet load dynamic Salesforce reports? How about pulling values from Salesforce for Google Documents? Or maybe archiving customer chat history as record in Saleforce? These are the real integration that makes them flies. Bcc an email alias to add email from Gmail is quite lame.
For companies who has been using on both SaaS, it's a welcome change, but I expect more.