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
If you search the web for wordpress sites and add the urls to the text file you can then open the index page and add a comment to all the sites in your list. If you use a nice vague comment like " I like how your blog is laid out I have bookmark this look forward to seeing more." Or something that would fit any type of blog then you can go crazy getting backlinks from many sites. I do however recommened that you change up the comment every so often.
Its a dirty method of getting backlinks using wordpress comments