The Visa I was using for billing with Linode had an authorized "test charge" earlier this week, and I had the card number replaced. Now I see this, and it makes me wonder.
My Visa (that I use for Linode) was compromised this week too, someone tried to order ~$100 of stuff from Amazon but my bank rejected the charge and now I have to wait another week before I can make payments again (killed my card...). Probably a coincidence but it makes me wonder too...
Was that credit card number used anywhere else? Given Linode's size, it's not surprising for a few customers to have had coincidental CC compromises recently.