I got a message asking about these socket labels so just thought I would share my response with the group at large also...
the labels are Tool Tagz I picked up from Northern Tool locally in the store here in Minnesota. I can't seem to find them on Northern's web site, but here is the Tool Tagz site
http://tooltagz.com/
They are pretty good, but somewhat overpriced for what they are since you need several packs to label a full set of sockets (shallow, deep and 3 drive sizes).
I also made some using a Brother label maker, you can get yellow (and gold on black) tape for those also. The tapes run at least $20 in addition to the label maker, so no free lunch there either! But then you can customize your labels and they are also pretty tough like the ToolTagz. The label maker is good for all sorts of stuff like fastener labels too.
The labels stay on pretty good, they do shred sometimes if you are in a tight spot, but not too often.
They do make it a lot easier to find sizes quickly so overall I'm pretty happy with them.
Good luck to you!