I'm very fond of the American AllSafe "Cudas" glasses. These are made as safety glasses and they work well against gravel, bugs, etc. As you can see, they are inexpensive at US$7.50. I just ordered up some clear ones for winter commuting. The same company makes other styles too, some of which are sleeker (click the "other products" link if interested).

Great thread I have a few random remarks to add...

1) blinkies are wonderful I've noticed basic 3-LED blinkies from ~3 blocks back in daylight on other cyclists' bikes in the city. They catch one's eye, and I think they are becoming identified with cyclists especially. With the runtime that they get, you might as well run your blinkies in the daytime too, especially if you have a decent one.

2) if you have a rechargeable light system that has enough runtime to do so, run it in the daytime for enhanced visibility. Don't die with your headlight off and fully-charged, that's what I say.

3) if you ride in the dark, and are open to the idea of sticking reflective tape onto stuff, look for the amber color. It's more visible than red, and it does not necessarily imply either rear or front, so you can use it all over the place. I got some very powerfully-adhesive amber glass-bead tape at a local store's auto-parts section and put some on my frame, fork blades, helmet and left crankarm. Got to get some more and stick it to the rims...

4) People who ride in wet conditions, have rim brakes (not disc), and have to stop a lot: check the amount of brakepad material you've got left every once in a while. Wet conditions eat up your pads much faster.

5) People who are getting started and have a low-to-middle-budget bicycle: if your bike comes with no-name spokes, and you break a spoke, just have the wheel rebuilt with quality spokes and be done with it. Cheap original-equipment spokes might be OK for the occasional rider, but if you're a commuter, you deserve DT or Wheelsmith at least on your rear wheel.