Great thread! I love reading blogs and will check out all the ones here. My two favourites are:

The Minx-girl blog - http://minxcompendium.blogspot.com/
Bike Writer's blog - http://www.pedaltohealth.blogspot.com/

I enjoy the non-cycling blogs on here too - Shannon's lights, and am trying hard to follow up every blog I see linked to in a signature.