James' post prompted me to look into the scoring environments that each of the top 20 in PPG from his post and adjust them. So, I've done that.

Basically, I've gone through Hockey Reference and gotten the average Total Goals Per Game for the league in each year from 1960-2009. I then averaged out the scoring environments for a player's career span.

For instance, Wayne Gretzky played from 1979-80 until 1998-99. From 80-99, the average scoring environment was exactly 7.00. For someone like Mario Lemieux who had his career interrupted, I simply took the average scoring environment from 1984-85 to 1993-94, then from 95-97, and then 2000-2006. I then averaged those together to get a total scoring environment of 6.28 total goals per game during his career.

I believe the way to adjust this is to take a player's points per game total multiplied by the current scoring environment, then divided by the player's career scoring environment. I used the "current environment" to be the scoring environment to be from 2005-06 through the 2008-09 season.

An example is Dale Hawerchuk and his 1.186 PPG. He played from 1981-82 through 1996-97. The average scoring environment over that period of time was 7.17 total goals per game. To adjust to today's (06-09) rates, it's simply this (someone correct me if I'm wrong):

1.186*5.86/7.17 = 0.969.

The 5.86 is the total GPG from 06-09 and the 0.969 is his new scoring rate adjusted to now-a-days.

The new Top 20, sorted by an Adjusted Point Per Game Total:

Environment is the scoring environment during the career of the player. Adjusted is a player's PPG totals adjusted for todays scoring rates and Prev Ranking is their ranking in unadjusted PPG while New Rank is their, obviously, current ranking in adjusted PPG. The final column, Diff, is the amount a player rose or fell by adjusting for the environment. Like I had thought in my comment on James' initial post, Eric Lindros' 1.14 PPG total (actually 1.138) and Bernie Federko's 1.13 (actually 1.130) were not that close. Federko's adjusted rates put him last on this list, dropping his PPG total 0.238 -- which over the course of 82 games is just about 20 points. Meanwhile, Big E played during a defensive-era ushered in after the strike-shortened season in the middle-1990's, and gives his PPG rates a boost. His PPG totals were pretty much on par, as the scoring environment he played in (5.79) isn't that much lower than it's been since the lockout. However, he does move up the list 9 spots due to guys like Marcel Dionne, Peter Stastny, Kent Nilsson and Guy Lafleur dropping due to playing in high offensive eras.

At the very least, this is an interesting way to look at players from different eras in a more favorable light.