Planet13 - 7:46 pm on Dec 30, 2011 (gmt 0)
And get no response whatsoever. Not even a curt "Thank you"...
I know how frustrating that can be, too... but that frustration is what prevents your COMPETITORS from obtaining juicy .edu links.
In a situation where there are OBVIOUSLY lots of outdated links, I just find one or two easy ones and email them first and see if I can get ANY kind of a response. If not, then I MIGHT look for a few more, and send those in a follow up email. I would also try and compliment them on the work they had done and maybe ask them a question or two about their research.
If nothing from that, then I would probably move on or, if it is a great site, pick up the phone and CALL them.