GMail Resources

[heidi]

From Slashdot:

Reader marklyon writes "Third party developers have stepped in with utilities that enhance and improve GMail. One utility, Mbox
& Maildir to Gmail Loader allows users to upload their existing email to
their GMail account. Another, POP
Goes the GMail, offers the ability to access your GMail account with any POP
mail reader, giving users the ability to permanently archive messages. GTray
lives in your taskbar and alerts you to incoming messages. Other, more
general programs, allow you to forward your Hotmail
or Yahoo! Mail messages to your
new GMail account. The question that remains, however, is whether Google will
work with or against third party developers in GMail's future."

Has anyone tried any of these yet? Are they good? Useful? Spyware-infected?