Popup Blocker lets you control the annoying alerts that popup all over your iPhone or iPod at just the wrong time. A 10 day trial is included with the latest release. Popup Blocker allows you to configure whether specific alerts should popup when your device is locked or unlocked, and even if your device screen should turn on when an alert occurs.

Currently, Popup Blocker supports blocking:

Calendar Alerts, SMS Alerts, Voicemail Alerts, Location Requests, Accessory Warnings, Network Lost Warnings, App Deletion Warnings, App Store Ratings, Low Battery Warnings, Low Disk Space Warnings, Backgrounder Alerts and Call Failure Warnings.