Firstly, GREAT plugin! I didn't know I needed this until I found it!
Anyway, a question. I was under the impression that a CSV file was comma separated and not semi-colon? Does mean that I have to save the file, change the extension to txt and them import it into my spreadsheet program that way.
Can I change to comma separated output and if so how?
Second, a suggestion. If you are looking to develop this plugin further, may I suggest that you allow the export fields to be defined? I only need first name, last name and email address. It may be useful to allow a user defined field so that I can tag the source of the list (ie. blog 1, blog 2, etc)