Disable your anti-spam and let spam comments post to your blog but don't approved them... For example, the link on spam comment says "spamdomain.com", open your yahoo site eplorer and search "spamdomain.com" ir will show all pages where spamdomain.com got backlinks... LOL... Now you can post your comments on those pages unmoderated... Not quality links but a backlink is always a backlink... use blogcommenter then... simple but effective... that's how you find unmoderated blogs through spam comments