As Morey said in the original post, "let's be careful out there."
http://sahga.com/forum/viewtopic.php?t= ... dust+devil
Here's a video compilation on the topic: http://www.youtube.com/watch?v=Q3QcMB2owFc

Please keep in mind:
1. Dust devils are more likely during the spring and summer than any other time of the year.
2. They don't always involve dust, and the invisible ones are every bit as destructive as their dusty cousins.