Yahoo! Mail disabled free access to its POP3 service in April 2002. This resulted in many people (including myself) to look for alternative free POP3 services. This application emulates a POP3 server and enables popular email clients like Outlook, Netscape, Eudora, Mozilla, Calypso, etc., to download email from Yahoo! accounts. Works great!
http://yahoopops.sourceforge.net/