netmeg - 6:59 pm on Sep 11, 2007 (gmt 0)

Probably expired domains that were taken over by parked domain spammers.

Actually, I've had domains I've bought that were NOT parked picked up by the search engines. They were two variations of my name; not likely to be been owned before or expired. I was planning on pointing them to my personal site, but forgot about it, and lo and behold came across one of them in the SERPS one day; when I checked, the other one was there too. Another domain I bought, a .org, showed up as a #2 SERP under the .com without a site or parking or anything. Don't ask me.