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I go over the speed jumping / pogo jumping in TF2, showing how to preserve your momentum, by not hitting the ground. It's possible to achieve amazing speed with this, but the faster you get going, the more accurate you have to be while aiming your rockets at the ground. This technique is extremely useful for getting around, faster than any other class, except perhaps a demoman. You can clear 2Fort from battlements to battlements faster than a scout by speed-jumping over the bridge. It's also possible to get to mid faster than a scout by speed jumping as soon as you jump out of the window-type thing.
Gunboats recommended when doing this! :)
The map is jump_pagoda, and I chose this map, just because it's an open space.