Statistics

Statistics are a future system that will get added to Minecraft. Notch talked about statistics (along with Achievements) on his March 18th Blog Post.

Statistics on the Minecraft.net profiles
Notch also commented that the plan is to show achievements and statistics on the profiles of the Minecraft.net site.

Statistics in the raw files
Times Played

Worlds Played

Saves Loaded

Multiplayer Joins

Games Quit

Minutes Played

Distance Walked

Distance Fallen

Distance Swum

Distance Flown

Jumps

Distance Dove

Items Dropped

Blocks Mined

Items Crafted

Items Used

Tools Depleted