I use posts with specific category IDs to create "feature" blocks on a front page. I need to use the category numbers to write the templates for these custom pages.
It would be simple and nice to have a listing of a category's number in the category window. The slug, parent category, etc. are listed on the page. It would be simple to have the id number listed on the page.
I know I can hover over the category name and see the ID in the status bar down below. But it seems it should be stat on the page.