"Hmm," you say, "I thought I specified Non-Commercial in my Creative Commons License. Let me check on that."
And so the journey begins.
Log out of Instructables and find your own Instructable. Click on the "more info" link.
Step 1: Download that PDF
So while you're logged-out (as if you're an anonymous Interweb lurker), click on that PDF link.
What's this? I need to have a "Pro" membership to download PDF's? Okay ... and it's a modest (but not Non-Commercial) expense. Hmm ...
Update 2009-Aug-19: I should have read closer. In 7(d) it says, "you grant Instructables the world-wide, royalty free, perpetual, irrevocable, non-exclusive and fully sublicensable license to use, distribute, reproduce, modify, adapt, publish, publicly perform and publicly display such Content solely for the purposes of providing and promoting Instructables." It's the "royalty-free" thing that implies they can collect money but they're under no obligation to pay you part of it.
Step 2: No, really: download the PDF
From my limited vantage point, it appears that any user who signed up before that whole "Pro" thing gets to download PDF's. Or maybe it's just our own. Regardless, I think anybody can download the PDF.
Update 2009-Aug-19: It's both. Users with accounts before Pro appeared get 3 months of Pro services and you can always download your own PDF.