We would like to direct you to the following for more information on native plant gardening as well as other horticultural, green industry and ecological sites.
An incredibly well researched and executed site with many detailed designs for rain gardens, big or small. Gardens for sun or shade, corners, islands, borders, you name it! Very good information on planning and installation as well. Extensive links on the subject.
The Native Plant Society of New Jersey offers a comprehensive guide for residential rain gardens in PDF format. Great information here!
Hope you enjoyed Carrie Wiles' Rain Gardens presentation at the Philadelphia International Flower Show on March 6, 2012. Here is her list of species recommendations.