A WebmasterWorld thread had reports that Google had all old cache dates for most sites on the web. By old, I mean, the last time Google said they "retrieved" the site was on the 15th or 16th and it was already the 22nd before Google showed new cache dates.
Here is a screen capture of what the cache date looked like on many sites:
Google is known for having fairly frequent cache dates and crawling patterns on most sites, even sites that do not update all that frequently.
Last night, senior member Atomic noticed Google started to update the cache dates with fresher dates. But until then, Webmasters were really worried. One even joked, "maybe they've ran out of room."
Forum discussion at WebmasterWorld.