I built a set of these and they worked very well. I left mine very long, and they are a good height for standing shots:

http://www.youtube.com/watch?v=uqsQjpx87zo&NR=1

This version may be even cheaper and easier. The stakes are a bit shorter, so if I make a set of these it will be a height for sitting or kneeling:

http://www.youtube.com/watch?v=KPQe2tCGAQk
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