Unsent Letters is growing by leaps and bounds. Almost everyone has a letter they wish they had sent, and now you can...even if it's just anonymously. AND, you can get paid for it. AND, you can get it published in a book! Of course, not every letter is accepted, but as of right now the editor (Michelle L. Devon)is reading and responding to all submissions.
Even if you do not have a letter idea, read the blog with the accepted submissions. Some of them are incredibly powerful and heartfelt, and today's is controversial as well--check out the comments and weigh in!
I sent in a submission, but she has so many to go through that it will probably be a while before I hear back. If mine is accepted, I'll post, but it will be posted as anonymous so you won't know which one is mine. :)