[Bob Williams]

I just noticed what you meant by security concern with the 'i'. Sorry, I misread.

That said, while it is a security issue, the threat only slightly increases an already very big threat--sort of like unbuckling your seat belt in a plane that's falling from 35k feet. Such spoofs are done all the time without requiring mixed case. While mixed-case presents more opportunities, it really comes down to the fact that you shouldn't go entering personal information into a site unless you trust how you got there. This is one of those cases where software simply can't protect users from their own carelessness.