Lame_Wolf - 7:11 pm on Oct 28, 2011 (gmt 0)

the data comes from my raw logs (which I dump into an off-line Access database) and run several relational tables against it... one of which is "linkfrom" which contains links to the site AND the first date added to the table. I can then do date calcs, etc... which also alerts me when I HAVEN'T had activity from a known link after 60 days... reminds me to check on that link to see if it still exists.

Although not 100% foolproof, that is about the best way to go about it, even if there is a (possible) learning curve to achieve it.