I was sent over this link from its author: Romans Chapter 3 Verse 28 (Updated). It's a well-constructed post examining the thrust of "alone" in Romans 3:28. Most interesting are the different renderings in different languages of the verse. Well done!
Martin Yee (Lutheran Theology Study Group) has a concise post up on the same subject: Sola Fide - Luther's justified by faith "alone" in Romans 3:28.