The Joint Information Systems Committee, an organization based in England, has launched a tool to help libraries and researchers compare and contrast different online databases.
The Academic Database Assessment Tool (ADAT) lets you quickly see the similarities and differences among different databases (at least a couple of them are British, so they may not be as useful comparisons for us across the Atlantic), as well as between different platforms (think EbscoHost, ProQuest, FirstSearch, among others).
There is a basic User Guide available, as well as an accompanying report that details the methodology.
The software is fast, the screen output is clean and well organized, and the site has a Creative Commons British Attribution-NonCommercial-ShareAlike license. This could change the way you choose your databases!
from ResourceShelf