People are going to say a lot about what drivers should do. I agree with all of it. However, no matter how much we improve driver awareness, we have to assume that the roads are full of drivers that don't see us or don't know how to drive safely.
So here's my advice to my fellow cyclists, plus a note for the police and state patrol.
Attitude: When you ride a bike, remember that the driving habits that put cyclists in such danger are the norm, not some road rage that only flares up when a cyclist is present. Cars hit each other all the time, but most of the accidents are minor fender benders so drivers accept the risk. Riding a bike as if you are like any other vehicle on the road makes you subject to the same risks. It's not fair. It's not right. But being an activist in the saddle and insisting on your full rights every time your ride is not going to fix it.
Visibility: Consider using a very bright, flashing headlight in the day.
Sidewalks: You can ride on the sidewalk in Seattle. Use this to get around dangerous roads. It's particularly useful on long climbs where you are going to have to ride slowlly anyway; you might as well be out of traffic.
Police: Please, PLEASE, bust drivers for having side windows tinted so dark that cyclists and other drivers can't make eye contact. If I'm going down the road and one of these blacked-out cars comes up from a side street ahead of me, I have to assume they don't see me and slam on the brakes, creating a risk of other kinds of accidents. There's a law on the books regulating how dark windows can be tinted. Let's enforce it.