What is great blogging

Last year Dave Weiner did a great job of defining what makes for good blogging. The criteria don't just apply to blogging, but any writing in general.

People talking about things they know about, not just expressing opinions about things they are not experts in (nothing wrong with that, of course).

Of course, Joel Spolsky, who I think is great, rants about how anecdotes are not science. This is true, but what Joel misses is that popular-science writing should be considered examples of good journalism, not good science. If the observations and areas of study are new and interesting, then by all means someone who is an expert at digesting and presenting the information (a journalist) should help us all understand it.