Awesome plugin. Works great and is very simple. Great work.
One question: I notice that if the plugin encounters an existing username/email address among the spreadsheet data, it just adds that user to the error log and moves on. We would like to see this instead:
The plugin should still log this, but instead of just skipping the user, it should add the existing user to the current blog (this is only relevant in a WPMU setup).
Any thoughts on adding this as a checkbox option? Any advice on hacking the plugin code myself in pursuit of this?