UVME is a pack created by the TrackMania community, which goal is to improve its quality. It's a selfrunning executable, which allows you to select, which coponents to install and integrates a restoration system to uninstall the pack easily. In detail, the extension features:
* Improved menu icons
* More detailed and higher resoluted textures for all environments
* Corrected reflections on vehicles
* Higher resoluted sky textures
* HD vehicles for all environments, including basic grey skin
* TMO, TMS, TMN, and TMU original music
* HD loadscreens, also for wide-screen resolutions

So if you're bored, or would just like to get Trackmania onto the state of art, get the TMUF (460 MB) or TMNF (24 MB) version of the pack.

Get info here: http://uvme.strangeplanet.fr/

Have fun!

PS: You can choose to install only a subset of the features aswell, instead of all of them.