We had ours the weekend before last in the UK... results on the RSPB website once they're collated. It gives a snapshot of how many are in your garden at a given time, rather than a more rounded, overall picture of how many species visit... for instance, I know there are two robin families withing flapping distance - they visit my garden for food, but none of them appeared during the hour I was watching... so they don't appear on my list. That might give a false reading, implying there are robins in this area.

Still, it's all valuable information, not least the manufacturers of bird feeders and seed providers.

LTS