O.K so you find a good PR site and you leave a comment and use a href= Do you need to embed that with a title or will just a dot do or something? So it doesn't look as obvious, or do you need a link title for it to be effective?
I think you'd need to use a descriptive anchor text for it to be useful. Some sites don't actually mind you leaving a link to your site in the sig of your comment, if your comment is relatively long and useful.