I’m not sure how I didn’t find this earlier, but thanks to a colleague, Erik Christopher, I am now aware of the JISC eBook comparison chart. It is available on the JISC site at http://www.jisc-adat.com/adat/adat_ebooks.pl and offers a comparison of up to 7 different eBook platforms including: Credo Reference, NetLibrary, ebrary, EBL, MyiLibrary, Dawsonera, and Taylor and Francis eBookstore. Over 50 functional features are compared with basic Y/N responses including search, access control, search results, linking, restrictions, exporting, etc. All data is supplied by the vendors. They are obviously missing some reference eBook databases, so I hope Gale, SAGE, ABC-CLIO, Oxford, Rosen, and others can hop on board this chart. If anyone is shopping for eBook platforms, or if publishers are considering launching an eBook site, this is a great place to go for ideas and industry standard features.
They also offer a comparison chart for scientific databases.