Just saw this today. Pretty cool of Valve and the developer. I wonder how they are gonna make money from this .

A free game in the truest sense of the word, TrackMania Nations Forever lets you drive at mind-blowing speeds on fun and spectacular tracks in solo and multiplayer modes.
TrackMania Nations Forever offers a new "Forever" version of the Stadium environment, a solid solo mode and 65 brand new, progressively challenging tracks. TrackMania Nations Forever will unite an even larger number of players than the original Nations thanks to its engaging multiplayer modes, innovative online functions and revolutionary interactivity between players.
For TrackMania Nations Forever, Nadeo studio chose to take advantage of the PC's capacities as a gaming, creative and communications platform in order to allow a greater number of players to share a unique gaming experience:
Features:
A completely free game.
A captivating solo mode with 65 brand new tracks.
Join millions of players online and compete on thousands of tracks on the TrackMania servers.
One complete TrackMania environment: Stadium "Forever".
An in-game editor to create your own tracks, video studio to realize your own movies and a paint shop to customize your vehicles.
Official ladders for solo and multiplayer.
Compatible with TrackMania United Forever (profile and multiplayer servers).
N/AComing soon
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Game Details
Title : Trackmania Nations Forever
Developer : Nadeo
Publisher : Focus Home Interactive
Languages : English, French, German, Italian, Spanish, Portuguese, Japanese, Traditional Chinese, Korean, Slovakian, Dutch, Russian, Hungarian, Czech, Polish
Single-player Multi-player Includes level editor
Latest News
New Trackmania Games Available N...
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System Requirements
Minimum:
Supported OS: Windows 2000/XP/XP-x64/Vista
Processor: Pentium IV 1.6GHz / AthlonXP 1600+
Graphics: 3D accelerator 16 MB DirectX 9.0c compatible graphics card
DirectX Version: DirectX 9.0c or better
Memory: 256 MB (512 MB with Vista)
Sound: 16 bit DirectX compatible sound card
Hard Drive: 750 MB free disk space