EDIT: Thankfully, Dave Arneson is still with us, so I've removed my "in memory" post. I have never have been so happy to have been wrong. I truly suggest that everyone let Professor Arneson know what his contributions and work have meant to them while they can. Here's an address where you can do just that:
1043 Grand Avenue
St. Paul, MN
If you found yourself saddened because you didn't tell Professor Arneson what his work meant to you when we thought he had passed, this is your chance to do something about it.