Just over a year ago I posted my plea to Canon asking that they make it so I can lock the mode dial on my Canon 5D Mark II. Last week they announced a program to replace your mode dial with a locking one. Apparently it will cost $100. I assume it will involve a visit to an authorized service center. Worth $100? Probably.
Update: I called National Camera today to ask about this program. They haven't heard a thing. The guy I talked to said that a number of people didn't like the new locking mode dial on the newest Canon cameras so he wasn't sure it was really something that people would like.