A:
1) Check to make sure the tags are in the body of the posts. Our spiders parse the posts into it's various sections such as the title, footer, and body. If the tags are outside of the post body, our spiders will not see them and they will not be indexed.
2) If your blog home page displays summary information, make sure your tags are included in the associated Atom or RSS feed. This will probably mean displaying the full posts in your feed.
3) Verify the format of the tag code. Please check to make sure you include a defined tag relationship of rel="tag" for each link you would like indexed as a post tag.