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I never really thought about it, but I suppose the old Googlebot could probably follow that link and hit the "next" button a few times before it gets tired.
I had for a month (it's since vanished) a "LINK TO" my site from specific "Comet Search" results. Considering that Comet (more of an annoyance, than anything useful) doesn't even have a web based way to access their search, I found this interesting. Near as I can tell, someone did a search for a specific site (whose name is a substring of my domain name). Google then crawled that site's public access logs, hit the results page and indexed it.
That's a possibility too. (erm - actually, thinking about it, it's probably a heck of a lot more likely than my first thought)...
G.
(link broken up so that formatting isn't screwed)
So...I'm thinking the same has happened. How? Well in both Google and AlltheWeb there are lots of webserver logs which include refferal info. Which is a valid link to follow. So...Googlebot hits a log file, follows the links, hits ICQ, or someone else, and then follows links of it...
Grampus: I've had more or less the same happen to me. A client included a url that had been marked for Inktomi inclusion only (for tracking) in a press release. It got indexed by Google.
So...the lesson is, if you don't want something in Google, don't put it on the Internet, or make sure that disallow list is current!