I've been thinking of adding a Bread crumb trail on the site. Still debating if this trail should be dynamic (i.e. a true trail of the pages that the user accessed) or a static one (hard-coded on the page itself).
Ha! Finally I published the pages I had created on the Kaprekar routine/series/numbers; also made the code/software for Kaprekar series generation available for public download. Check it out at Kaprekar Series Generator.