This will be the first 37Signals product that their staff don't use regularly in their own business. It will be interesting to see whether this means Haystack is less successful because they will be eating less of their own dog food.
Here's haystack.com couple of years back: <a href="http://web.archive.org/web/*/http://haystack.com" rel="nofollow">http://web.archive.org/web/*/http://haystack.com</a><p>I wonder how much they paid for the domain?