BIRDS-N-GARDEN.com in Austin, TX has a nice article called Butterfly Gardening with emphasis on the considerations for your backyard butterfly habitat and how to solve some common problems (e.g., too much wind, shady spots, unproductive grass lawn, winter butterflies, thirsty butterflies). Diagrams are provided of some simple butterfly garden plans in the shape of an island and a listing of some plants (e.g, Salvia, Butterfly Bush, Rudbeckia, Cosmos, Pentas, Verbana, Coreopsis, Black-foot Daisy). Checkout the article for more details!