Google isn't really about search, it's about data aggregation. I would say any of the important web applications are also within the group of "core products" t

Google isn't really about search, it's about data aggregation. I would say any of the important web applications are also within the group of "core products" that Google "sells", including the upcoming Google Health, GMail, and Google Docs & Spreadsheets - but the main point is to be working on the thing that is what the business is "about". I would also add that one of the things that has thus far made Google different is that its employees have greater opportunity to add to the core business than do employees at other companies (GMail is a perfect example).