I worked on a tool like this for my own personal use a while back. But after reading the terms of use for the site I backed off...
"This website is for personal and non-commercial use. You may not modify, copy, excerpt, distribute, transmit, publish, license, create derivative works from, or sell any information, or services obtained from this website." (emphasis mine)
I realize that it's not being sold, but 'creating derivitive works' is a serious issue when it comes to intellectual property law. I'm not trying to be a killjoy either. Just be aware.
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Searching through the cave. Team VaxCave.