The other blogs Byron mentioned are high on my list also, but I wasn't familiar with #2 on his Top 10 -- Eco Velo from Sacramento.
Alan and Michael utilize bicycles as transportation to reduce their impact on the environment. Eco Velo is the public expression of their commitment to reduce their impact on the environment by employing bicycles as their primary mode of transport. They use Eco Velo to share what they learn from this endeavor while celebrating the beauty of the bicycle and the joys of everyday bike riding. Alan an Michael hope to inspire others to make a similar commitment through Eco Velo. So do I!
Remember, this weekend August 23-24 2008 is the Single Speed World Championship in Napa, California. Most of the bikes in this race are singlespeed mountain bikes, but singlespeed and and fixed gear cyclocross, road and "other" bikes also take part. It should be fun stuff.