Do you know of any blogs which are under-rated? LivingRoom is having a contest to highlight blogs which deserve more recognition. Go give your recommendation. (Being no stranger to self-promotion, I've already recommended myself as well as a few others.)
One thing I noticed is that some people have odd definitions of under-rated. One Hand Clapping, Captain's Quarters, and The Belmont Club are all very good blogs, but they receive from 100 to 300 times the traffic I do, so it's hard for me to call them underblogs.