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The FastServices project, which will allow programmers to write software which integrates with FastMail.FM, is now well underway. There is sample code for VB, C#, and Perl, plus docs, here: http://www.fastcheck.org/phpbb2/viewtopic.php?t=332
It's important that AppleScript, Java, Delphi, and other programmers get involved at this point, otherwise FastServices may not work will with these languages. So, if you're a programmer, please register on the above forum and get involved!
If you know any keen programmers, especially Mac programmers (since there aren't any involved at the moment), please let them know about the project.