Each year, Inc. Magazine publishes a very comprehensive guide to business valution and mergers & acquisitions activity.  2009 is no exception.  If you're into reading, buy the magazine.  If you like playing with gizmos on the web (which you must since you're reading this blog), move your mouse pointer over the colored circles below until you find your industry.  This will give you a general understanding of where the valuation of your business may be.

You can also find the whole Inc. Magazine valuation section here.