Here is my favorite picture from today. I was experimenting with my flash some more. Specifically, I was experimenting with High Speed Sync (H Flash on my Canon Speedlite). To my understanding, what High Speed Sync does is allows you to use a higher shutter speed than you otherwise would be able to and the Speedlite automatically adjust the strength and speed of the flash to match your setting. That's the best explanation I can offer for High Speed Sync right now. You can use this with night photography. Of course, your flash won't illuminate or freeze objects that are far away - they have to be in flash range. The downside to flash, especially when it's the only source of light, is that it's very one dimensional unless you are using multiple multi-directional off-camera flashes. I'd love to do that one day. Here is a neat blog dedicated to the purpose of educating photographers about off-camera flashes - Strobist. I think it's fun just to read about - even if I don't have the ability to delve into this area yet.
Here is my picture, taken at dusk.
30D, ISO 640, f14, 1/80th of a second, 70mm of 70-200L, at dusk with high-speed sync setting on 430EX Speedlite