Many authors, one query letter

I ran across your blog today and was wondering if you knew the correct way to send a query letter with multiple authors, or do you think that we should use only one name in our query letter?

The correct way is to list all the names of the authors involved. Unless none of you wants your names known, in which case you should construct a pseudonym.

I'm not sure why having multiple authors would even be a cause of concern - lots of books have more than one author!