I have created a new package that I intend to submit to CTAN. Before I do so, however, I would like to get some feedback on the package. The target audience is anyone who teaches introductory or undergraduate physics, but I feel sure others would benefit from it too. I'm including a link to the current beta. It's distributed as a single .dtx file that self-extracts the necessary files when processed. (Yes, I know I'll have to submit the various files to CTAN.) I develop with TeXShop and its various engines so you may have to do something different to extract the package.