Here's a new link a friend told me about:
http://nwf.org/nativePlantFind...
I haven't explored it much yet, but it looks really neat. It lets you find native plants for your area and find out which butterflies use them as host plants. There's also a feature allowing creation of a personal list, which will be handy when I want to figure out which caterpillar is on one of my plants, etc!
