Not sure I fully trust online security measures. Of course, most sites are far more secure than, say, Target's, but there are a lot of enterprising geniuses out there whose sole mission in life is to hack anything and everything. Too bad that genius couldn't be applied to maybe a cure for cancer, but that's the world we live in.
Okay, well you do more than most folks.
Keep in mind that Target’s recent fiasco was not a result of online security failures but physical security faults at point-of-sale systems. The people who were affected were shoppers at physical stores.
I’ve had my CC number swiped a few times as a result of skimmers at restaurants: people who have a second card swipe that is used to catalog your account number for later use. It’s impossible to track who’s doing it. Your best bet is to memorize the 3-digit CVV2 number on the back of your card and physical scratch it out of the card with a knife. If people at points of sale ask for it, decline to do business with them. There’s no reason for POS people to have that number. That’s a newer measure put in place for online security.