Sounds like someone has sold your cc #. Similar thing happened to me not long ago - turned out the waiter at a restaurant was collecting cc #'s and selling them online. Then companies like ArtSparta bid on them or buy them up. I no longer let my cc leave my sight at restaurants. It can be a pain however, it's better than cleaning up ID theft.
Same here. $5.77 charge was on 9/4/08. Same phone number was given as reference. When I called the number all I got was a mumbling recording. I called the CC company and they removed it immediately, saying that they had had similar complaints.