- Clear representation of perspective
- Commerical disclosure
- Reliability of information
The issue of confidentiality is far more relevant to a doctor or a lawyer, but there will be times when a science blogger has information she or he should not share...like a manuscript you're reviewing that has something awfully cool...but there are probably far fewer examples. The issue of commercial ties is also true, but likely to have much less weight
If the author is using their blog to pitch a product, it must be clear that they are doing that.After all, few ecologists are wined and dined by company reps (I can see it now, Forestry Suppliers sending former beauty queens as sales reps to ecology labs...)
The issue of reliability is important. If bloggers aren't taken seriously, then we have to do our best to change that perception. And then there's courtesy. I've said something about this on my commentary on Tim O'Reilly's blogger code of ethics. More later, once I've figure out what I think about the matter.