keys transposed (Score 1)

I've noticed one wierd behaviour: sometimes when I've just switched to an app, the first two keystrokes are transposed on insertion. I've seen this in Mail.app (when searching), Aquamacs and Firefox.

"hte quick brown fox, etc."

Either this is a new typing disorder I've recently developed, or perhaps it's related to 10.5 (but what evil magick is this?)

Anyway ... anyone else noticed themselves making the same typo repeatedly, and wondered?