Google announced in this morning’s Google Search Breakfast that it is integrating Gmail emails directly into Google search results. This means you can search Google and find emails from your Gmail (not Google Apps) account directly in the search results.
The Gmail results show on the top right section, collapsed neatly and ordered by relevance of your query.
Google will also show relevant contacts and upcoming flights found in your email based on your search query.
This is currently an experiment, which you can sign up over here. It is available for the first one million who sign up.
Postscript: See our detailed article, Up Close: Gmail In Google Search Results Field Trial.