Pidgin appears to have stopped working with Yahoo starting about 2 days ago, but there's a quick way to fix this...
Gyachi is a Yahoo! client for Linux operating system that supports almost all of the features you would expect to find on the official Windows Yahoo! client: Voice chat, webcams, faders, 'nicknames', audibles, avatars, display images, and more.
Previously, the way to connect to Twitter using Pidgin (IM client for yahoo, google talk, msn, etc), was to use a jabber account like google chat, then add Twitter. But Twitter shut down the Jabber service. So it doesn’t work anymore. But now, Pidgin-microblog can do the trick.
YPOPs! is an application that provides POP3 and SMTP access to Yahoo! Mail. This application is more like a gateway. It provides a POP3 server interface at one end to talk to email clients and an HTTP client (browser) interface at the other which allows it to talk to Yahoo! The same concept holds good for SMTP as well.It works with all know email clients like Outlook, Thunderbird, Evolution, Eudora etc.
If you've switched from Yahoo! over to Gmail because you prefer to read your email in a desktop client such as Thunderbird, you probably are wondering how you can do the same thing with Yahoo! for free.