Started contributing to Wikipedia (in earnest) June 2006. So far I have mainly contributed (and initiated) bridge articles, and math / physics stuff. I have also written a few backgammon and poker articles. July 2006 I started my biggest Wiki-project so far: compiling a comprehensive list of optimal plays for the various suit combinations that occur in the game of bridge. (See, however, the section "Beware of OR-fundamentalists" below.)
I am a starter and much less a completer. As I have strong faith in the 'wiki process', I experience little thresholds in initialising new articles. I do post immature articles and love to see these grow and improve thanks to your contributions. When an article is in an early stage of development, I am less interested in details, spelling, lay-out, formatting, etc. This 'slopiness' does not mean that I have any tolerance for content that is factually incorrect.