I have been using this jacket (and the matching pants) for winter commuting in Minnesota. I has worked well for Spring/Fall rainy days when it is cooler.

http://www.performancebike.com/shop/...tegory_ID=1130
http://www.performancebike.com/shop/...tegory_ID=1130

I agree with the other posters that it is just too hot to wear a rainsuit in the summer, so I usually just get wet it it's warm. I may try a cape this summer though.

The jacket and pants I linked have held up well. They have pit zipper vents, and have been great with a pair of tights under the pants, and a Champion C9 long-sleeved top and UnderArmour top in weather down to zero here in MN.