An uplifting tale is unfolding over at De Rerum Natura. Back in 2005, blogger Reed Cartwright posted his thoughts on the genetics of an Arabidopsis mutant. It turned out that another researcher in the field was thinking along the same lines. Long story short: Reed was invited to be coauthor on this paper. The story has been picked up by The Scientist. Sadly, unlike the blog post and the paper, you need a subscription to read that article.
Take-home message: post your hypotheses, wild or otherwise, on your blog. You never know who might be reading.