I recently learned through a colleague of this wonderful database comparison tool from JISC (Joint Information Systems Committee) in the UK - the Academic Database Assessment Tool (ADAT). "This site from JISC Collections aims to help libraries to make informed decisions about future subscriptions to bibliographic and full text databases." You can use it to compare Journal Title Lists (with Venn diagrams!), features of different database platforms and eBook platforms. The information's not all perfectly up to date, but JISC lets you know exactly how old the data is. When you drill in to the "dashboard" for a given database you'll learn all sorts of interesting information about the content it covers, including total number of titles, publication types (trade, scholarly, magazine, etc), worldwide distribution of the title list's countries of publication, top 10 languages occuring in the database, and top 10 occuring publishers. Neat site - check it out.