The cubmaster & I MC'ed the race using the info that the cubs provided and several parents came up to me later to tell me how much fun it was to listen to us adding "color" to the races.
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We hand wrote the car #'s and the weight onto the sheets - we used the NOW WEIGINING IN AT 4.997 ounces talk track. people loved it. MUCH better than Gangnam Style or other top 40 music
https://docs.google.com/file/d/0B_N-3kB ... M1Yjg/edit
In between ranks, we had a computer with a MP3 player playing a mix of "road tunes" over the PA. Had 3 hours of music set up (50 songs) - and the last song finished just before the finals.