A dozen years ago, Mathsoft.com (see Waybackmacine) listed a section of mathcad-related books. I counted around 40+, around half or more in the last 5 years (2000-05).
I recall, distinctly, that there were at that time many websites with mathcad tutorials, showing and offering .mcd files to download and learn. Calculus, differential equations, economics had their mathcad experts that offered plenty of inspiring work.
Now there is very little left, and that little is often just a fraction of the material that was created and made available more than ten years ago.
So the landscape nowadays looks very different, unfortunately. I hardly recall 1 book about mathcad (Prime or not), in the last five years or so. I came across recently with the resources of one of the most popular authors of math textbooks (ronlarson.com). He makes available resources and files for mathematica, maple, matlab. But nothing about mathcad, even if it seems a much better tool for tutorial purposes.
I feel that without such resources the future of mathcad will not look good. I do not know if this is just my impression. I hope to be wrong because of I miss something.
Contrary to the above pessimism, I should say that this forum is very well kept and supported by several experts that offer help. I still fear may not be enough!
Just a proposal: could PTC provide a page that connects to the other valuable resources about mathcad around the net, and signal any book or material that makes use of mathcad?
Thanks.