No huge length post here but if you have an iPhone 3G, they are recalling most (all in the US and in many other countries) of the power adapters. You can read about the recall and how to get a replacement , which has a link for a web form to submit your recall request or you can do the exchange at an Apple store after October 10th (which is whey they’ll start shipping replacement orders as well).
It looks to me like the issue is the prongs break off in a power outlet sometimes. I move my adapter daily (until I get a second one so I can keep one at work and one at home) and haven’t had any issues. I’m not going to stop using it as they recommend, but I will be on the lookout for any problems and if it does break off, I’ll make sure to notice and take action to prevent any injuries or issues. If you can’t manage to do that safely, sure, stop using it and charge via USB all the time :-) Don’t blame me though, officially I’m telling you to stop using the adapters now and wait until October 10th to get a new one. Go ahead, I’m sure you’ll always be close to a USB outlet to charge your phone a few times a day!
Thanks to whoever I follow on Twitter  who brought this to my attention; I’m not entirely sure at this point who it was. If you haven’t seen it here, you probably live under the tech news rock that I do much of the time (tech news can suck me in, so I often stay away for lengthy periods of time!).