Here are some links for you to check out the O line Talent. A lot of the second and third round prospects appear to be zone blocking scheme players unfortunately.
http://www.lindyssports.com/content.php?id=2223
http://walterfootball.com/draft2008OT.php
Chilo Rachal and Roy Schuening are definite candidates for the 2nd round at the guard position.
Round 3 and on I am keeping an eye on John Greco of Toledo who is a RT that may be better suited to the Guard in the pro's. I agree that Mike McGlynn is a good candidate for the steelers. Also value might be found in Kirk Barton of Ohio State.
Keep analysing