I watched a video by Matt Cutts again a moment ago about the immediate future of SEO, you can see the video here [youtube.com...] and I got the distinct impression in two places that Google is going to be going 'upstream' more often to deny web spammers any benefits from link schemes.
- Matts comment about going upstream is at around 3:13 in the video
- Matts comment about the effects of exchanging blackhat tips or hanging out on blackhat sites is at around 4:27
That second comment suggests that those who engage in blackhat linking practices also tend to hang out on blackhat forums etc and, given the other comments, it sounds like Google might be keeping an eye out for those who frequent these types of sites(upstream)?
I don't practice or condone blackhat linking practices but I have learned some valuable information about how to protect my site from various linking schemes by visiting articles(indexed in Google no less) that are on pro-blackhat sites. While I'm not overly worried, are your web browsing habits a consideration in how well your website ranks moving forward? It seems far fetched but, well, you heard Matt.