Friends don't tell friends: Avoiding Inbred Links
I happened across the donors page of an open source link directory script and recognized a cluster of names in there. I also noticed that the owner of the page had subsequently nofollowed the links that were listed on this PR 6 or 7 page, hehe. Whoops.
It's unwise, imo, to go about clustering your links with someone else's links. I keep my links as separate from the links of friends and associates as I can. So if I see clusters of links to websites I recognize, I often stay away because I want to create a map of inbound links that don't intersect with recognizable SEO IBLs.
If you find a donors page with a pr 7, it's best to keep it to yourself. Otherwise, all these great pages are going to show up all over the internet with the same gang of six listed in each one of them. Ack.
Look at who else is listed
If you see the same SEO brand names popping up in the link directories or text link pages you are considering advertising in, think twice. If those websites are already in there, that page may likely already be above the radar.
One thing I've been thinking a lot about lately is footprints, and the need not to leave any.