Adventure Cycling Blog is the go to place for bicycle tourists planning trips across the US. From maps and gear to advice and reviews this blog is the leader of the Cyclo touring pack.
Bike Radar is a very good all around blog covering racing, commuting and recreational cycling. They have a very extensive and in depth review section for bikes, parts, clothing apps and more. I think their lean is more toward the racing side but you should be able to get plenty of information on just about every aspect of biking.