mslina2002 - 1:05 pm on Nov 29, 2012 (gmt 0)
I don't worry about those links either, though they are not in the thousands like yours.
Whenever I get a 404 error from an incorrect back link pointing to my site, I mark them as "fixed". It goes away. If they were in the thousands I would definitely not hesitate to use the disavow tool to kill off the pesky scums.