Well like i said before i was working on a few maps and i finally finished My city race track, No video yet, ill get it up later tonight. So what to expect…its a massive city built as a race course, styled like sanfransisco rush, i included several shortcuts unfortunatly during the testing phase the course only lasted a minute so in order to extend the rush experience i kept the ideas but made the track lap twice, first lap takes you through the city, second lap rides the shortcuts, so that extends the lap to a 3 to 5 minute course, plenty of time to race your friends.
Lap 1 consists of straight run through the city base, lap 2 you will find a shortcut highlighted for you once you take that it will loop you through the rest of the shortcuts, including building jumping 
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http://www.bungie.net/Stats/Reach/FileDetails.aspx?fid=24138283&player=lordcrusnik1986
Map here: enjoy
Pics: http://www.bungie.net/Stats/Reach/Screenshots.aspx?player=lordcrusnik1986