I'm in the unique position to know the figures best, knowing roughly how many projects I haven't added to the project list at Unlicense.org. I have to say I'm at a loss to understand why you would think hundreds of projects implausible given that even simply googling for the uniquely-worded first line of the Unlicense returns 9,440 hits at present:
http://www.google.com/search?q=%22This+is+free+and+unencumbe...
If we merely added the projects of the people listed at http://twitter.com/bendiken/unlicensed to the project list, the list would certainly already be at 100+ projects; this can be easily and quickly verified even just by eyeballing the GitHub, Bitbucket, Google Code, SourceForge, etc. accounts of the people involved. And those people are just a subset of all the developers currently using the Unlicense.
To put this in proper perspective, even I just by myself have more Unlicense-using projects hosted on GitHub than there are total projects listed on Unlicense.org. (I have tended to not add my projects to the list so as to make room for others.)
Even lacking other information than all the previous, it's hardly a stretch to estimate hundreds of projects. And, I of course actually have further information, having been uniquely positioned to observe this ecosystem grow during the last year.
I didn't keep notes on every new project, and have no intention of doing so in the future, as we who maintain Unlicense.org feel no need to grow the project list there to anything all that much longer than it already is (it clearly states "a sample", and is arguably already too long as it stands today; it needs curation for quality, not expansion for quantity).
As I said before, if we, or someone else, wished to provide a comprehensive catalogue of projects who've adopted the Unlicense, that would already at this point need to be a tagged/categorized database to be useful to anyone. By next year, that, too, probably couldn't keep up, so what's the point?
None whatsoever.
Nor did I ever say I found it "implausible" that there were hundreds or thousands of projects using this license - that is your word. I just noted that you're pushing a movement and making a claim about its adoption without any clear basis for anyone else to believe it. I'm not a fan of blindly believing tossed-out claims. And no, when you throw around phrases like "I'm quite certain", you don't get to blow off skepticism with this isn't peer-reviewed!
"[H]aving semi-actively tracked the growth of adoption for the last year" doesn't mean much of anything - for all a random person knows, it could be a WAG on the lines of I saw 50 or 60 projects in the first month, so let's say ~700 projects by the end of the year.
It's great that you can point to much better evidence than that, in all seriousness. In the future, you might bring some of that up before getting defensive. I don't know you, and like many other people out there, I'd never heard of the Unlicense; you're not going to get blindly trusted.
