I find blog commenting annoying. I only seem to get my comments approved on about half the blogs I comment on. I do put useful relevant comments and not spam. Bloggers do seem to be VERY fussy who they approve. Although, it could be that I use keywords in the Name and not my real name. Some bloggers dont seem to like that. I cant see what the problem is provided the comment contributes towards the discussion and is not spam. I've wasted a lot of time commenting on blogs only for the comment never to appear.