Chrome as a Spider

Helping Google find pages not necessarily linked anywhere...

Interesting discussion at Webmaster World on how Google might be indexing pages that are otherwise private or hidden from the rest of the world.  Ran into this a few times myself when trying to set up a few heavy-load test scripts, only for it to get indexed and get outside hits as well. <_<
Some of the discussion floating around has been centered on the parsing of URLs in gmail messages, as well as indexing pages someone using Chrome or Google toolbar visits.