For those that use POP3 access to Gmail, you have most likely seen some problems this afternoon with access.  We have received reports that one of the SSL certificates used within the certificate chain has expired.  We are investigating this, and hope to have something more to report later.

Update (22:30 UTC):  This seems to have been resolved in the past hour.  Not exactly sure what happened, but I guess that is what you get for using beta software right?  In any case, thank you google for the free 2.6G and growing disc space.