We just release the AIR 2 runtime today (technically 2.0.2), and I’m releasing a new application to go along with it: MailBrew. MailBrew is an email notifier that supports Gmail (regular Gmail, and Google Apps email accounts), and IMAP. You can customize the notification location and alert sound on a per-account bases, and you can add as many accounts as you want.
If you haven’t gotten the new runtime, you can find it here, or you can just install MailBrew, and the new runtime will automatically get downloaded and installed. A screencast of MailBrew is available after the jump.