tedster - 4:08 pm on Oct 13, 2010 (gmt 0)

It seems to me that Google discovers a URL and then establishes a virtual link in their webgraph whenever any URL is directly in the source code (rather than generated by a script) and whether the action is POST or GET.

In the case I'm talking about, this would have been the only way the site could have been indexed as completely as it was, especially within a week of its launch when backlinks were rare. The key, I believe, was that the full text string of the URL was right there, directly in the source code.