Windows Phone Marketplace up to 90,000 apps

A large majority of apps in the Marketplace are free
The latest breakdown of the Windows Phone Marketplace by WP7Applist.com shows that 66% of all apps in the Marketplace are free, with 23% being paid apps and 11% listed as a trial. The leading category, with 17% of apps in the Windows Phone Marketplace is "entertainment," with "tools and productivity" a close second with 15% of the pie. "Games" comes in third with a 13% share of the apps in the Marketplace.
source: WP7Applist.com via WMPoweruser

There are now more than 90,000 apps in the Windows Phone Marketplace
Things that are NOT allowed:
To help keep our community safe and free from spam, we apply temporary limits to newly created accounts: