Ben Lorica at O'Reilly has updated his analysis of pricing trends in iPhone apps. Although it doesn't include the actual sales figures for the apps, it does look at the number of apps in each price category and the top 100 most popular.
During the last week of November, there were close to 9,800 unique apps, 22% of which were free:
The average price of a Top 100 paid app continued to decline, falling to a little over $2.60 in the last week of November:
In both the Social Networking and News categories, the Free outnumber the Paid apps. (Social Networking apps tend to be apps designed to help users access social web sites from their iPhone, while News apps do the same for news/media sites.):