Reference Miner 
Reference Miner searches the Internet to find and display reference information from PubMed, Amazon (US, UK, Germany, France, Canada, Japan, Italy, and China), Google Scholar, JSTOR (requires access privileges and ip authentication) and the Library of Congress.
Features include a built-in web browser, drag and drop download of pdfs (requires institutional access privileges), display of book cover art (Amazon), easy e-mailing, drag and drop citations into other applications, and the ability to perform complex searches. If your institution has a subscription, a double-click opens a PubMed full-text article in the built-in browser.
Reference Miner is available from the Mac App Store for $2.99.
Read a review of Reference Miner on Mac360°.
Note: The Internet search features of Reference Miner, and much more, are built into Bookends. If you own Bookends you do not need Reference Miner.
Here are examples of some of the search capabilities of Reference Miner (click for full size).
PubMed, multi-column
PubMed, single column
PubMed, advanced search
PubMed, browser with pdf
Google Scholar, advanced search
JSTOR, boolean search
Amazon
