Using GNU Privacy Guard with Mail.app just got a lot better. With the OS X 10.3 upgrade that has rocked a lot of worlds, the nice folks behind GPGMail updated their plugin, which is really just a nice go-between for Mail.app and GPG. The GUI integration has taken a big step forward in this new version, with my wish for a way to select which key you want to encrypt/sign with being granted. If you need to use GPG with Mail.app, there is no living without GPGMail.