iRobot is one of the top 3 companies I would love to work for - I'm sure you guys will stay as one of the major players in the coming years when autonomous robotics comes around. Have you ever considered starting your own company though, or do you plan to make youre career at iRobot?
Land mines have been killing people autonomously for years :).
You're right about the SK bot. Certain sites are just that sensitive: kill anything coming here.
Breaching the first two fences with warning signs outside a nuclear facility is probably another place to shoot first.
I suppose Tasers are a good alternative. iRobot is working with Taser to get their systems on our robots.