Sky Island Alliance in 2009 has started a multi-year biodiversity assessment of the Sonoran Sky Islands called the Madrean Archipelago Biodiversity Assessment (MABA). This project is much needed as there is a dirth of information about the region. Aaron Flesch is working with Sky Island Alliance on this project and is already collecting bird, plant, and other data.
MABA data is housed in a MySQL database connected to the web for public access. You can interact with these data at madrean.org. The are separate databases for flora and fauna.