Hello,
I think you have a security issue with your service.
I have two accounts. In the first one, I used your Google Reader import function with username and password.
That worked fine.
Then I wanted to do the same with my other Newsblur account. But this time I wanted to use the import function to import from a different Google Reader account.
It didnt ask again for the user name but just imported the feeds from the first Google Reader account automatically!
That means, as I am logged out from my Google account, that my username and password is stored somewhere!!