On CyberJournalist.net I found A Bloggers’ Code of Ethics. This code was adapted from a journalists code, so I am not sure if it should be applied to research blogs, but most of it reads right. Is there a research blog code? How would it be different?
Note, the link is no longer functional. Here is a different Code of Ethics from Morten Rand-Hendriksen. How to start a blog was also recommended to me as a place to get advice on setting one up.