'GMail' Utilities :

[#]. Gmail notifier helper-apps - "Gmail Notifier" is a downloadable Windows application from Googlethat alerts Gmail users to the presence of new incoming messages. Theapp displays an icon in your system tray to let you know if you haveunread Gmail messages, and shows you their subjects, senders andsnippets -- without your having to open a web browser.

[#]. "Google GMail Loader" (GML) : Import your existing email into GMail !

More 'GMail' Utilities available @

[#]. http://www.aimlesswords.com/archives/gmail/
[#]. http://www.marklyon.org/gmail/gmailapps.htm
[#]. http://www.gmailwiki.com/index.php/Tools_and_Utilities