Nice ride in this morning, no T-storms like yesterday. When I left temps were around 80 with moderate humidity, much nice than the expected 96-98 degrees this afternoon. This is my second day with my new cranks/cassette/bb/chain and I'm loving riding in the 48 tooth ring (I used my 39 exclusively before). I also tried out my new Nashbar backpack/pannier. I use it as a backpack and like the extra straps that keep it really secure on my back and much cooler than my other one. My left knee is still bothering me and I have yet to figure out my new Polar HRM. I tried it on yesterday's afternoon commute and it just beeped the entire time. I went back to the Sigma which decided it wanted to work again after a few days off. DC commuters-be safe in the heat (hydrate and watch your exertion level).