At Combinatorics and More, Gil Kalai has a nice explanation of the beautiful theorems of Helly, Radon, Carathéodory, and Tverberg (here and here). I’m looking forward to the next installment.
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Geometry and Combinatorics 
Dear Konard,
Thank you! This time there will be only two installement, but I plan related posts a bit later. –Gil
Maybe this post: http://gilkalai.wordpress.com/2008/12/23/seven-problems-around-tverbergs-theorem/ can qualify as a next installement.