I never hand-signal - I don't feel comfortable taking my hands off the bars for that long, and that's even with straight handlebars. (had some bad one-handed biking face-plant mishaps in the past) I'm probably working on a custom turn-blinker/brakelight after I finish my custom headlight and tail-light. I'm going to use 1-Watt orange-red Luxeons and MicroPuck drivers, but haven't thought about the switching circuit yet.

My second-favorite book is Horowitz & Hill's "Art of Electronics".