Lee Ambrosius has updated his AutoCAD commands page to show AutoCAD 2007 commands as well as commands back to R12. This is an excellent resource or even AutoCAD command trivia resource. I remember creating the first command map from R12 to AutoCAD 2000 and it took a few months of research but has been well worth it in popularity and assistance to AutoCAD users. For the past few years Lee has now became the proud owner of the command map and has taken it further as well as automated the back end to a SQL database.

http://www.hyperpics.com/commands/index.asp

You can access the command map table or get even more information and system variables as a member although Lee provides membership for free.