There have been reports on VersionTracker that httpmail works with EudoraMail (Lycos) accounts. It may work with others. Try it and find out!

For Yahoo! accounts, there is YahooPOPS!

http://sourceforge.net/projects/yahoopops

Good luck!

There's also YoSucker:
http://yosucker.sourceforge.net

which can download Yahoo! Mail and save it as a Unix mbox file...

Just point YoSucker to an mbox file in /Library/Mail and it'll append to it.

for example, here's the OUTFILE line from my YoSucker config file:
OUTFILE=/Users/myname/Library/Mail/Mailboxes/Yahoo! Mail.mbox/mbox

A cron job can run YoSucker every few minutes.

Pros: No psuedo pop server needed, can check multiple yahoo accounts, only gets
new messages, delete from server option, ssl connection available, works with
any mail client that uses unix mbox files

Cons: doesn't automagically show up as new mail in Mail.app (you need to select the
mail folder for Mail.app to recognize that there are new messagesin it), requires that
you install some perl modules