TP I found this on Slashdot recently, it is a semi-regular contest for programmers:
Tcl is one of the languages recognized for entries. I'm sure there are at least a few Tcl'ers in Wiki-land that might like to submit entries. Be sure to post your bragging rights back on this page.
AM (23 december 2004) Why not start a little contest of our own? With this extreme-daylength season there must be several minutes you can spare to think of a solution to the problem I post on Contest - finding repeating substrings