Thanks for the link tedster. An interesting read - even more bad news for me though.
My website provides information on its main page relevant to today so rich snippets would become outdated (and thus not particularly rich) within 24hrs max.
Given that Google has recently admitted it overlooked the importance of breaking-news feeds (Twitter) it's surprises me that they'd still be pursuing more caching.
As it is, my website scores #1 in Google for the appropriate search but they've stuck "12 Sep 2008 ... " in front of the description making it appear hopelessly out-of-date given that the description refer to information which changes daily.
I had to drill down to page 4 to find another site with a date in front of it like that (also 2008 btw).
I wish I could discover what is so "special" about my site (and very few others) to get this treatment.
You know what... yes it does! I have found it in one of the paragraphs. It's not formatted like that but it is there. I will have a close look at the code but right now I'm going to delete it and see if anything changes.
Be sure that if your content is date driven, that the date of last revision is the first date that Google sees in the source.
This was actaully true of my site. The latest date appeared twice in the rendered source in different formats, however - and this probably the key - the paragraph (almost at the bottom of the source) containing the 12 Sep 2008 date was the only place where the date was formatted mm/d/yyyy.
I think it was my lack of the use of the word "snippets" that caused me not to find threads relating to the date prefix.