I recently found published stats (Sacks Allowed, Penalties, etc.) for Offensive Linemen at the Washington Post website.  The numbers are from STATS, Inc.  Here's the main numbers:

Name (Position)	Sacks Allowed	False Start Penalties	Holding Penalties
Sam Baker (LT)	1.5	2	2
Justin Blaylock (LG)	0.5	1	0
Todd McClure (C)	0.5	0	0
Harvey Dahl (RG)	2.5	0	1
Tyson Clabo (RT)	1.0	0	0

They also include Yards from Sacks Allowed, total Penalties (including Personal Fouls, etc.) and Penalty Yards.  For an example, here's the link to Harvey Dahl.  I also like to use Football Outsiders O-Line stats.  Through Week 8, the Falcons are #8 in Adjusted Line Yards (Run Blocking), and #4 in Adjusted Sack Rate (Pass Protection).  Their website also gives ranks for ALY in 5 running directions: Left End, Left Tackle, Mid/Guard, Right Tackle, Right End.  They are above average in every direction except Left Tackle and Mid/Guard.

These numbers, taken together, seem to imply that Tyson Clabo has been the best performer along the O-Line so far this season.  Is he worthy of a long-term extension (he's 28), or is Garrett Reynolds going to be in that spot next year?  What should Dimitroff do to improve the middle of the line?  I will try to remember to update these numbers at the end of the season.