Thread:Project:Support desk/can using redirect penalise me

hi, I thought to use redirects for some pages of my wiki so that different format of title will bring to the same page just as wikipedia has. Now question is can that penalize my site? cos i read on http://www.google.com/support/webmasters/bin/answer.py?answer=66359 that duplicate content is caused by multiple multiple distinct URLs.. so can my case also be counted as duplicate content ? thanks