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I have been very happy with a Fotosharp rain cover: http://fotosharp.com/camera_rain_covers.html. They are made of silnylon and are extremely lightweight and stuff into a pack like a rag, yet set up for use quickly. The design allows for versatile application; the velcro-closed slot on the bottom allows it to be easily used hand held or set up on a tripod without compromising the protection. I was initially hesitant about the semi-opaque fabric making it difficult to see settings on the camera, but this has turned out to be mostly a non-issue. And on advantage has been that I can use it is a free, and very effective, flash diffuser: just use it over the camera and flash. It works great for macro flash shots!
I'd recommend getting a larger size they they cite as the minimum for a given lens combination. The larger volume is less constraining and provides more flexibility in use, and it really has not down side.
I just received the larger size Fotosharp rain cover. I have not tested it in rain yet, but I like the design and the material. It appears to be very functional for foggy/wet weather.
I think you'll like it. I just used mine during the height of Sandy. While with wet hands, and opening the back to see the screen inevitably lets in a small amount of moisture, it was more than sufficient to protect the camera from real harm during an hour of handheld shooting.