For those of you hardcore Greek guys, A. T. Robertson's magisterial A Grammar of the Greek New Testament in Light of Historical Research is available on the three main bible programs and the third edition (greatly expanded) is available as a very nice pdf. If you want original pagination for citation purposes, you can use the 2nd edition from archive.org. The 4th, and final, version is what bibleworks has (and I assume the other programs as well). The difference between the 3rd and 4th is apparently quite small. Robertson says "The Fourth Edition is a reprint of the Third with the correction of a few errata that remained." (pg. xx)
If you are interested, read a few reviews off of amazon.com (the link to the fourth edition).