Remember the good old days when you could trust Google to accurately display who linked to a given page when using the link: syntax? They’ve long ago stopped doing that, opting instead to show you a "representative sample" of incoming links to your site. At yesterday’s Cool Web Tools for Webmasters session, Darlene Fichter mentioned Yahoo! Site Explorer, which appears to me to do that same thing (show the incoming links, not a sample). Once you’ve entered a URL and gotten results, look for the little "inlinks" URL at the top of the results list and voila, you’re looking at who links to you! Haven’t done any scientific testing or anything, but it looks pretty good. Take a moment to read the help screen – it’s short and will be helpful to you in understanding the results and how your results will vary depending on how you enter a URL.