Tip: Use “Search in Google”
Searching in Google for text you read in a window somewhere else usually goes like this: Select the text, copy the text to the clipboard, open Safari, create a new window, click in the search field in the upper-right corner of the window, paste in the copied text, then hit Enter to start the search.
There’s an easier way.
To search for text you read in another window, right-click that then choose Search in Google to open a new window in Safari and start a Google search.
Hold down Command to search in a new Safari tab, instead of a window.

This also works in Mail, Preview, and most other applications in Mac OS X.
Thanks, it is very useful.
I had an interesting result when I tried it with the word “Mail” at the end of your article: the first result for Mail in Google is Yahoo! Mail, the second being GMail… Is this related to the Yahoo/Microsoft war?