Here is a Wordpress commenter. Now this is moody little thing and only likes some servers. So if it doesn't work for you then I am sorry. If a coder could look into this it would be great to get a fix.
Needs resume feature and the time out part looked at.Just find yourself a Google scraper for Wordpress sites and build up your own list.I have supplied a small one in the zip so you know the format to put it in as.
I added this for free as I am having a new one built that will have a lot of features including a scraper that works via proxy sites. So no longer have a need for this one