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Thanks Thomas. Great information as usual!

No problem at all. I wrote a Moz post on removing penalties a few months back. The actual article was targeted towards removing a manual penalty, but the information on gathering the data and analysing the links applies to both manual and algorithmic penalties - http://moz.com/blog/ultimate-guide-to-google-penalty-removal It's a bit of a mammoth article (sorry!) but should help you to identify which links are good / bad. Essentially, start with removing all the sitewide links. If you're affiliated with the sites and get referral traffic, you can nofollow them. Once you've done that, start looking at blog comment spam, forum profiles and article directories. If you look on OSE or Ahrefs, you could take a look at what your highest anchor text target is. You could then look at all the sites where you're targeting this particular anchor text and work to remove this first. Once you've done all that, try to build some links to your site (which are purely from commercial anchor text), but build the links naturally. Write great content about your niche, write for communities and try to write content that gives the reader some value. That way, you should get natural social shares, natural links etc which should help to lift the penalty. If you want more information on Googles guidelines, take a look here - https://support.google.com/webmasters/answer/35769?hl=en - It's pretty well laid out. Hope this helps! Lewis