iPhone AC Adapter Problems?

Jason O'Grady reports that he's noticed a high failure rate in iPhone AC adapters which seems to be confirmed by a few other reports.

I tested both with other iPhone USB cables, iPod USB cables, with and without the iPhone dock and in several known-good power outlets. Nada. Both phones charge fine when connected via the cable to our Macs so Im pretty confident that its the [power] bricks.

This has also been noted by a few members of our forum.

Have you had any problems with your iPhone power adapter?