How can I create a gmail pop account in mac mail in Mac OS 10.6.6
Mail searches an online database to see how to connect to an account; it defaults to IMAP for GMail because that can work better than POP, but you can override it later.  Tell Mail.app not to take the account on line immediately, then edit the account to switch it from IMAP to POP.

(Personally, I'd switch GMail to IMAP instead.)