With Mailbox opening up to everyone, and thus devouring the media attention for email clients, I thought this might bear mentioning. Triage is a simple email client designed to very quickly work through only the new mail in your inbox. With a flick you decide to archive or keep a message. If you keep it, it stays unread in your inbox, but you won’t see it again in Triage. You can also type out a quick reply. Works with anything that uses IMAP. I’ve sent the developers an email to see if it’s possible to have Triage delete rather than archive. If so, it’s a definite buy for me.
UPDATE: Just heard back from the developers, and the app can indeed be set to update rather than just archive.