I saw a bolide a few years back and reported it to the American Meteor Society. It was the third one in my life time. (I know a bolide when I see one). The first one was in 1965 near Lake Erie, and it lit up the whole sky in the early part of the evening.

>"Why are we seeing a rash of big blue-green ones right now? "

That's my question, and I think I would agree with you Peter. We must be passing through some space debris, like a comet that has broken up. It's the ONLY explanantion with these bolides being spotted in different places and on different dates.
And thanks for telling me the area you live in.
Quite a few people reported their sightings < a href="http://www.amsmeteors.org/fireball/fireball_log2007.html"><here.>;