Yeah, we know, it's quality not quantity and we agree with that 100%. On the other hand, this number helps give an idea of rates of adoption and growth of the platform. We always thought Microsoft would hit 2,000 by launch and it looks like they did it. Heck, it was just 2 weeks ago they hit 1,000. In short, although there are some hiccups here and there (the Guitar Hero app was fubar'd for awhile, fixed now), the store seems to be a success.
And only 1,800 of those apps are flashlights and tip calculators. We keed, we keed.
Source: Windows Phone Developer Blog