Want an easy way to keep on top of your email? In the Finder, press Command-F to bring up a search window. It should default to setting Search to This Mac and Contents. In the criteria row, click the first pop-up menu and select Other, then scroll down to Spotlight Items (you can also press spot... to jump there directly), and click OK. Set the second pop-up menu to include.
Now hit the plus sign to add another row, and set the criteria to Kind is Other, and in the text box, type Mail message. As of now, you will see all of your messages from Mail; if you want, like me, to show recent messages only, hit the plus sign again. On this new row, set the criteria to Created Date is yesterday (or whatever time period you prefer). Now you only see your recent emails.
Save this search as ...