Outbox’s intriguing new service collects your physical mail, then opens, scans, and delivers it via app or browser.

With a fleet of white Prius’ sporting giant, red plastic flags, Outbox’s “unpostman” will visit your home three times a week to collect your letters, bills, magazines and advertisements that had deposited there by official postal workers; they then get delivered to a warehouse where they are opened and photographed, and the resulting digital files are sent electronically to the recipient through the Outbox website or iPad or iPhone apps.

Want to choose an app for opening an e-mail attachment on your iPad 2 or iPhone 4 device?  Here’s how: open a file attached to an e-mail message by tapping the attachment in > Mail.