Here: http://paulsparrows.files.wordpress.com/2011/06/ismycreditca...

Your question reminded me of this and I see someone already responded. In any case you should get a new card if there was a chance you were affected.

Yeah, I used two cards and one of them already got smurfed (I put on block on the other one as a prophylactic measure). At this point, if you used a card at any Target in the affected time period, just assume your card has been sold and is going to get used.

This is going to get macroeconomically expensive, I think.

If you used your card at Target between Nov. 27 and Dec. 15, you were caught up in the breach.