Ted Benson has a clever approach for hacking the Amazon Dash button:
So, conceptually, problem solved. We just have to:
1. Prevent the button from actually ordering anything
2. Listen for Dash Button ARP probes, and
3. Translate those probes into spreadsheet updates
The process outlined in the article is much easier than I expected. I wonder if Amazon would ever be willing to make it even easier though, by optionally hooking it up to IFTTT ( If This Then That ).
At $5 the dash buttons are a cheap experiment.