If you go to Google Insight you can track the search trends of key words or phrases. A Labyrinth Lord search is here.
The stats make a lot of sense really. The searches begin in 2007, obviously, because that is when LL was first released. It looks like there was a sort of flat trend in searches until April 2008, but with major highs and lows, until May 2008 when we start to see a steady rise. That is about the time of the Labyrinth Lord distribution drive, and after that searches have been on a definite rise, but again with highs and lows, but lows haven't been nearly so drastic.
I don't want to read too much into this, but at least as reflected in Google searches there seems to be an ever steady increase lately in interest in Labyrinth Lord. I can say that sales, especially hard copy sales through Lulu, have been steady since May 2008, with a tendency to rise over the last 3 months or so.