end-user subscription databases

[Tomaiuolo, Nicholas (Library)]

Hello colleagues,
I know about Questia and XanEdu, both are subscription databases that are
being "marketed" to end-users (students and professionals alike), I have
also read about "Panic Button", another subscription resource aimed at
scientists.  Would anyone happen to know of/have experience with any other
products that are specifically targeted toward end-users by subscriptions?  

On a related matter, and forgive me for asking a leading question, but
aren't these resources redundant when juxtaposed to library databases
offerings?  And therefore, why would students buy into these subscription
resources?  I'd love to read your comments.

Thanks!
Nick

Nicholas G. Tomaiuolo, MLS
Instruction Librarian
Elihu Burritt Library
Central Connecticut State University
New Britain, CT  06050

860-832-2068 (office)
860-832-3409 (fax)