When you sign in to your mail account, your new messages will appear as a stack of cards. Simply flick messages up to archive, or flick them down to keep in your inbox for later. You can also tap a message to view its full contents, and compose a short reply.
Triage supports Gmail, Yahoo! Mail, and iCloud Mail accounts, and most email services that support IMAP. (FastMail and DreamHost users — support is coming soon!)
You can purchase Triage from the App Store for $1.99.