I have 3 road bikes I use for commuting. First is an all weather steel Centurion that I've fitted with fenders. The other two is a Schwinn Fastback and Litespeed Teramo. These two are strictly for dry weather only. I don't have racks on any of them. I use a backpack to bring 5 days worth of clothes to work. This allows me to ride with nothing on my back for 4 days. The trip in on Mondays and the trip back Fridays means a backpack full of clothes but its well worth it.
I have two routes I take. A flat 22 mile rt and/or a rolliing hll 29 mile rt. All on paved roads.