Been testing Eudora along with gMail using the imap feature. Works great! I also appreciate the built-in RSS reader functionality. Looks like many similar features as the updated mac os mail application. You can check out details on the Eudora 8 App here: http://wiki.mozilla.org/Eudora_Releases
Just started testing the imap feature of gmail with the open source version (8.x) of Eudora. So far so good. Looks like it works pretty well. I also really like the RSS reader functionality of Eudora. Might just have to make this app my full time email client on the PC.
Thank you life hacker! 2007-guide-to-free-software-and-webapps