No craigslist response from me - always best to create CL account in order to retain anonymity.  I suspect a marketing database was hacked resulting in the 'SMS blast' in hopes that some vulnerable person would give out their credit card numbers! DON'T DO IT!

I got the same text message on my prepaid gophone.  I don't use the phone for anything except talking to my girlfriend.  I think I might have put it on a Fred Meyer Jewelers credit application but nobody else should have the number.  
Here's what it looks like:
From:
+18016240153
April 12th, 2011 at 8:33 PM and it stated:
CARD SERVICES ALERT: Your CARD has been DEACTIVATED. Please contact us at 360-489-7217

Scam. Report to your financial institution and the police. My wife and I both got one within minutes. We have no cards with text alerts. Do not call or give info.

Recieved a Text message from this number stating that it was the Evergreen Direct Credit Union. And that my Debit Card Information and stating that my card ending in 4*** had been deactivated.  Anyone who has recieved this Message or calls from this number needs to hang up.  If you have questions you can call the REAL EVERGREEN Direct at 360-943-7676.  If you suspect that you have been scammed called your bank or other financial institution and inform them.

I got a text from 801-564-4035 saying "CARD SERVICES ALERT: Your CARD has been DEACTIVATED. Please contact us at 360-489-7217"
They did not have any card information and did not state which credit union it was.