Well done for using DoFollow – I’ve done the same on my blog, to help share a little GoogleJuice 🙂

DoFollow has a handy option to only remove the nofollow from links that are over a certain age – so you can set it so that only comments added over, say, 3 days ago get the nofollow removed. That way, if a spam comment slips through, they still don’t get followed by Google for 3 days, which is plenty of time to remove it.