Cheah Chu Yeow: gExodus - a graphical Gmail import tool
Cheah Chu Yeow wrote gExodus, a graphical Gmail import tool. It’s a slick way to move email from Thunderbird (for example) to Google Mail.
[tease]
gExodus allows you to import your emails (in mbox format) into your Gmail account. The mbox format is the classic Unix-style mailbox format, and is used by Mozilla Mail/News, Mozilla Thunderbird, qmail, and many other Unix email applications.