I have been teased really badly twice recently on Yahoo site explorer. The 1st time was about a month or so ago now:
I typed in linkdomain:www.seoco.co.uk and up came this URL: http://www.w3.org/Mobile/planet. I got really excited and actually did a little jig thinking that I had been linked to by the W3. But I had not been linked to by them, this guy called Andrew Grill had linked and his feed is displayed on that page. The link from W3 was temporary and pretty worthless.
Today again I was teased whilst checking the links to this site. The URL I saw come up was from Harvard no less: http://cyber.law.harvard.edu/planet/idtechtools/, the stuff link building dreams are made of. I really got my hopes up only to once again find that it was a temporary link. This time it was because a guy called Ethan Zuckerman had linked to me.
So there you have it, don’t get excited about the links you see in site explorer until you are sure that they are permanent. The links from Andrew and Ethan are also amazing of course.