I was showing off some of my designs at a recent Makerbot user group meeting, and I wished I had tags for them with QR codes and some other relevant data. This bookmarklet will generate such tags.
This is a smaller version, with the QR code on one side and the human-readable information on the other.
Note: I initially set the license to CC-BY for the example picture because the CC licenses look a little nicer on the tags, but I've changed the license to PD, so feel free to use it however you want.
Update: Some errors were reported with the DOM walking, so I rewrote those portions to use Regex instead. This should improve compatibility.
Navigate to the page for the Thing you want to tag, then run the script. It will grab the relevant data and format it for tag printing. I haven't done extensive testing, but it should work in all standards-compliant browsers (old versions of IE might have a problem).
Print the tag, cut it out and fold it over. Fold the end over into a triangle (for strength), then punch a hole and attach with string to the printed thing.
Update: for those still having trouble, you can get bookmarkable links for Thingitag and Thingitag Jr. at http://whosawhatsis.com/paraphernalia/thingitag.html
Update: I fixed these for the new Thingiverse design AGAIN, and I'm getting sick of it. It works, but I've only tested it in Chrome. If your browser of choice doesn't work, use Chrome instead.