I found a site called http://www.BacklinkWatch.com which when you type in a URL, it returns a list of URLS which contain backlinks to that site, the PR of the pages containing those backlinks, if those links are follow or nofollow, the anchor text of the link on that page, OBL info – Outbound Links which means total external links found on backlink giving webpage, etc.

If you see someone leaving comment spam on one of your links, you can see the URL they are trying to leave a link to, or do a bit of further investigation to find this out (search for parts of the words or strings of the words they were trying to post) to find different places they’ve posted on to find out their url. Then, type in their url into http://www.backlinkkwatch.com and get an entire list of where they have posted successfully to. You can then see these by follow/no follow and page rank. Of course, you want to target the higher page rank pages/sites and the ones that are Follow to get the proper “link juicce” and benefit from your links. I’m about to create another post with information on search strings you can use to build up lists of places to get backlinks from as well.