1000.

Today I received my 1000th hit at Where's Willy.  It kind of snuck up on me over the last couple of weeks.  My next milestone will be my 900th bill hit, but that's a good way away, since today's hit was my 841st bill hit.  It's theoretically possible I could reach 1100 hits before 900 bills hit, but I'd have to see my re-hit rate go up quite heavily for that to happen.