This is a work of genius. It must be, because I can't understand the first thing about it. Scanning the QR code on my Nexus 1 just results in a failed download, presumably meant as a subtle hint about my inadequacy.

sob

Ok, so from the link faramarz posted - Try putting this into the text box & hitting "Save":

  (1) Hello, world!
  [Go Home](2)
  [Go Elsewhere](3)
  (2) You went home!
  (3) You went elsewhere!

I've also found it'll take html links, though I haven't tried anything more complex.

It looks like the QR Code contains the whole script. The docs mention using it for step-by-step troubleshooting, etc - basically a self-contained instruction set for mobile devices. Not sure where the actual app for the phone is, though...

Ummm... could we get a bit more details about what this is and how to use it please?

Looks like we're not the only ones confused.

read details at http://www.googlelabs.com/show_details?app_key=agtnbGFiczIwL...

Here's what Breadcrumb is described as:

  Breadcrumb enables you to create a variety of mobile learning applications 
  and allows you to make your application work with only three additions to plain text.

  Infinitely scalable, easy to create, and readable on Internet-enabled smart-phones
  or computers, Breadcrumb gives you maximum output for the development time.

Edit: Formatting

I don't entirely get it either. Does it generate the printable sticker?

Breadcrumb Create an easy-to-use mobile learning application without any programming experience.

And is xss-able <script>alert("Pwnd");</script>

I could be wrong, but it looks like it's used to create mini-sites, so being able to use Javascript seems more like a feature than an xss vulnerability.