Planet13 - 7:06 pm on May 11, 2012 (gmt 0)
Well, I think that SEOmoz should first concentrate on giving more comprehensive link reports. I find that the seomajestic reports are far superior, as was yahoo site explorer.
there was another link analysis tool (I think based in the Ukraine or Belarus) that had something of a pretty good metric for approximating the "value" of a link. I don't think it dealt with web spam per se, but I do think it was a pretty good first step in determining whether a link might be worth chasing.
But really, one's own judgement would be the best "anti spam" tool, wouldn't it? I mean, it's sort of like jazz; if you gotta' ask someone what spam is, then you will never get it, right?
A good business idea though, as a lot of people will be willing to do it in a desperate try to get the lost traffic back (Panda, Penguin, or whatever else).