We had a similar experience when we launched secretpoke : http://news.ycombinator.com/item?id=2179649
We have been on the home page for about 24 hours, and on the top position for ~3 hours. In those 3 hours only, we saw about 5K uniques on the homepage of the app. But the most valuable thing was the 100+ comments that we got, and helped us improve.
Here was our take on the subject : http://secretpoke.posterous.com/how-we-used-hns-feedback-to-...