In reply to Russell Lovett:
A bit of terminology that you could search on is
Pole Aerial Photography
for getting photos like this
http://www.flickr.com/photos/26712210@N05/4614184140/
you can buy various masts and booms specifically for elevated photography - these tend to cost mega bucks. Most people usually adapt some other sort of extendable pole to take a camera, this might be a window cleaners pole, painters pole, pool cleaners etc.. or use a fishing pole.
safely getting something the weight of your 5d+glass safely up metres into the air, repositioning and back to the ground again may be difficult - the leverage exerted on the pole by the weight of camera might be too much.
a fair place to look at what other people do including how they mount their ca,era etc is the Pole Aerial Photography Group on flickr:
http://www.flickr.com/groups/pole_aerial_photography/