Cliffsides

Speedy little dirt track with a few extras -- a day-night cycle, medal ghosts, tarmac section, new music... As the name implies there's a theme going with driving on (and off!) the edges of cliffs.
You can download the Medal Ghosts if you want company on the track.

Musically, I'm kind of a fan of Trackmania Sunrise's mix of rock, electronic, and quasi-singer songwriter types of songs and wondered what Valley might sound like in that style, since TMS never really had anything like it. Don't get me wrong, I love the music it has, but if it was more along those lines I think it might have sounded something like this.
Unfortunately the comment tags still don't like to show up in the MP engine.