I just did a google search for “collaborative programming” + wikki on google and came up with (the only match!) Pair Programming: More Learning and Less Anxiety in a First Programming Course. Not exactly what I expected to find, but very relevant nonetheless. Perhaps even better, the paper is hosted at The GE Master Teachers for Freshman Engineering at Northeastern University which seems to be a clearing house for best practice. A partcular gem is Chalk Talk with Jonas Chalk which is a essentially a L&T Best Practices FAQ written in the form of an Agony Aunt Column.