http://www.macnn.com/articles/10/10/04/gmail.growl.support.support.soon.other.imap.apps/
New minimalist mail software, Sparrow for Mac, in beta
updated 07:55 pm EDT, Mon October 4, 2010
Gmail, growl support, support soon other IMAP apps
Independent developers DINH Vięt Hoŕ and Dominique Leca have launched a new email application, Sparrow for Mac. Currently in beta, the software provides a minimalist presentation with threaded conversation support. It also provides Growl notifications and uses a status bar icon for quick access. Users can get a quick overview of their mail in the preview window, can open a new window for a specific item or open the full window to see both at once.
Sparrow can switch between multiple accounts -- It only supports Gmail currently but will integrate several IMAP-based email providers in the near future. The free beta can be downloaded now. Requirements have not been announced.
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Joined: Aug 2001
When Mobile Me is added ...
... this will definitely bear checking out for me. Not that I'm unhappy with Mail, but I definitely like the look here.