So now that 2010 is more than half over with no attack that I know of, have you or mattnewport's opinions changed?
(I notice that domestic terrorism seems kind of spiky - quite a few in one year, and none the next: http://en.wikipedia.org/wiki/Category:Islamist_terrorism_in_the_United_States omits entire years but has several in one year, like 2007 or 2009.)
I am more confident of winning as you'd expect. But I'm finding it counterintuitive to adjust my subjective probability for losing the bet in proportion to the portion of the year that's lapsed, which means either my initial probability was too low or my current one is too high.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.