I am once again a Premium member! Thank you all for your help.
I must have accidentally tossed that "Payment Failed". But as soon as I saw the problem I updated my credit card in PayPal. Last night I saw this in PayPal's description of my subscription:
Subscription Date: May 25, 2003
Time: 11:40:39 PDT
Status: Failed
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Last Payment Attempt Date: May 27, 2008
Next Attempt Date: May 30, 2008
Amount: $3.00 USD
And sure enough, the payment went through today, the "Next Attempt Date".