I've included the release dates for each of our 2006 Top 20 PDFs.
#1. Superline #4: Hell's Belles (2005)
#2. Ken Hite's Dubious Shards (Cthulhu/Delta Green) (2006)
#3. Superline #5: Dinosaurs! (2006)
#4. Superline Gamemaster's Series: A Fistful of Plot Devices, #1 (2004, updated in 2006)
#5...