Hey buzzman, from my experience, webmasters tools on google shows you backlinks that they found during a month when that months info goes live, which usually occurs in the next month. IE. August data shows up in complete on like September 10th.
So if your site is new or you have gotten 1900 links very quickly, they probably won’t show up until next month on google. There is a slight delay on yahoo as well, but not usually more than a few days. Did you put the setting to links pointing to anywhere in the domain, rather than just the home page?