Note: I've removed the anonymous login for now. If you'd like to post missing persons information, please use the comments to this post. Thanks.
Along with Overtaken by Events, I'm making my blog available for people to post missing persons reports. Other participants, as well as details on how to post, are below.
If you don't want to be bothered with posting, feel free to leave information in the comments and I'll promote it to a post this evening. Thanks and I hope we all find the people about whom we are concerned.