We had exactly 155 downloads of the Nelso Prague iPhone app in the Czech Republic1 yesterday (January 7, 2010), which earned us the #15 spot for free apps. This put us ahead of Google Earth, Facebook, and Skype.
The previous day (January 6, 2010) we had 125 downloads in CZ, which got us the #25 position. Based on this info, I'd guess that the total number of downloads from the App Store in the Czech Republic yesterday was fewer than 10,000.
1 That is, we are counting here only downloads from users in the Czech Republic, and not including downloads from any of the other App Stores.