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Xoc - 5:12 pm on Mar 5, 2001 (gmt 0)
Maybe that makes a difference. I don't make changes to the existing content all that often, although I'm adding new pages frequently. I don't submit to Northern Light, so that doesn't explain it. Fast is by all the time, too, but I submit there. This is on three different web sites.
A week ago, I implemented some new technology that causes the Last-Modified http header to always return 18 hours ago. Before that, there was no Last-Modified date getting reported because IIS doesn't normally return Last-Modified dates on Active Server Pages, because it can contain dynamic content. One advantage of my solution is that the last-modified field of a SERP will always tell me exactly when it spidered the page.