For the last several years, I've made it an offseason tradition to look at active major leaguers and compare their career WAR to Hall of Fame precedent to see which players are on pace for Cooperstown, with annual updates to track the best players' career trajectories.
Hitters, Part 2
Pitchers, Part 1
Pitchers, Part 2
A mid-season follow-up on the importance of old-age success in determining future starters (methodology post)
Proto-"Future Hall Series" pieces
In 2012, I looked at how big the Hall of Fame should be, then decided to apply those findings to more recent years. The results can be found here:
2006, Part 1
2006, Part 2
2006, Part 3
What Would a More Accurately Sized Hall of Fame Look Like?
Prior to that, in 2010, I tried a more simplistic approach going position by postion, paving the way for my future attempts. Articles linked in order of publication:
AL and NL East Pitchers
AL and NL Central Pitchers
AL and NL West Pitchers