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I was experimenting a couple of months ago with some parameter changes by typing them in. Those pages are now indexed. I can only assume that the toolbar picked these up.
However, I should also say that my site appeared in AltaVista with no backlinks because it was still in development. I think some search engines must monitor domain registrations.
Kaled.
How can Google tell you the PR of a page unless the toolbar sends that data to Google? ;) The possibility of Google using whois data is also a strong possibility. We know Google has all that, because GoogleGuy posted they use it to know if a domain had expired, and thus they won't count the old backlinks if someone buys it up.
Also, are you 100% certain that nobody may have linked to this site?
Probably part of Google trying to increase the number of sites indexed, although I'm not sure that newly registered sites offer the best of content.