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I've also seen pages that got added to Google "today" without a date - it happens on my site quite often. Haven't figured this one out, yet. I put a date stamp at the bottom of each of my pages so I can see when it was crawled in the cache.
It is strange, though, how sometimes (as you mention) that there is a total lack of fresh dates in Google - despite the fact that there really ARE some fresh pages in there, they just aren't labeled.
Fun Stuff!
G.