Hoople - 1:51 am on Oct 26, 2010 (gmt 0)
If they're a small portion of your link profile I agree with wheel. Having more than a minor portion in spammy sites might affect your site reputation with Google. ie you are in a 'bad neighborhood'.
See [google.com ] From that page's 'Quality guidelines - basic principles' subsection: (my emphasis below)
Don't participate in link schemes designed to increase your site's ranking or PageRank. In particular, avoid links to web spammers or "bad neighborhoods" on the web, as your own ranking may be affected adversely by those links.
If the spam links are in the majority consider doing:
1) Send out 'take down the link' notices to the sites. Be happy if more than 20% comply. There was a post here recently about these scraper sites links contributing to a slight uplift in traffic and serp performance. 2 threads with member's perspectives on the topic [webmasterworld.com ] and [webmasterworld.com ] both about inbound links from less than reputable locations and the effects.
2) Change some page filenames (to break link) if you can easily recreate a cleaner link profile.
3) Go out and get some good high quality links from authority sites and peers in your niche to effect a lower spam percentage.