As you may notice my blog do not displays links in the comments, mainly because a lot of comments are post only to get a backlink to commentator site, if someone really wants to contribute something to the discussin then he will do it no matter if he will get something (link) out of this.
However, after some thinking on this topic i decided to add recent comments plugin which will have bold do follow links pointing to your site. I do not know if it will get popular or not and will you start post more comments on this blog, however i think that if someone decides to post comment interesting comment which would add value to then i think that such commentator should be rewarded somehow, i can’t (and won’t) pay for the comments so i guess do follow bold link with your selected anchor text will be satisfying.
On the other hand you may do not like recent comments plugin and prefer top commentator or any other similar plugin if so … post comment in this thread 