Creating Multiple wordpress logons without the blogs, is it possible?

Hi,

I have noticed that a few sites are now requiring Wordpress logon only for posting a blog comment.

I have not been able to find out how to get multiple wordpress usernames without starting a whole bunch of blogs. Basically if I wont to post different URLs to a whole bunch of blogs, i will need a whole bunch of different wordpress usernames and associated URLs right?

Any help?

I have checked with the wordpress.com service and it seems that you can either attach a whole bunch of blogs to your one wordpress signon (and one associated url) or you can create a wordpress username without a blog, but it doesnt have a url attached.

Not sure how other IMs in here get around posting different URLs with just one wordpress logon?