An interesting tool to analyze the competitions backlinks uses a combination of Google SERPs and Yahoos reported backlinks. Since the Google link: command is now unreliable, it makes sense to use a tool that examines the Yahoo backlinks instead. Although I noticed some inconsistencies with the tool, it can be a very good way to see how you stack up with your competitors. Check it out at http://www.webuildpages.com/tools/internet-marketing-google.htm.