Hi,
Here's my tracks for TrackMania Nations ESWC.

My 1st:
http://www.angelfire.com/goth2/the_syco/TM/syco1.Challenge.Gbx

My 2nd:
http://www.angelfire.com/goth2/the_syco/TM/TIG_1.Challenge.Gbx

The 1st is simple enough, as in you just race around the track, but the second... some holes you go through, some  will stop you...

To play them, save the tracks into the folder (Right-click, and "save as" to):

\TrackMania Nations ESWC\GameData\Tracks\Challenges\My Challenges\

Any feedback would be nice. Also, any links for your own tracks, put them up.