Via Gary at the SEW blog Ask Jeeves: Cache Includes the Date and Time Pages Were Last Cached. Although it takes forever for Ask to Index a New Site, they added a feature to the cache pages, that shows the last crawl date of the page. So for this blog, the last time they crawled the homepage here was January 16th, or 4 days ago! That is for a page that updates several times per day. Whereas my corporate site has a cache date of January 13, 2006 5:14:32 AM.
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Note that this kind of reveals how fresh the Jeeves index is...
Forum discussion at Search Engine Watch Forums.