what would you do if wordpress changed to ajax/flash comments? search engines like google does not do ajax/flash. if wordpess switched to ajax/flash comments would you still comment on blogs for links?
Google already indexes text in flash and they recently announced that they will index javascript links and those will also pass PR now. Most of my comments are meant to get my 'useful' sites exposed to lots of bloggers. Life is not all about dofollow links, branding and authority status also matters.