Indispensible

This is one of a small handful of plugins that I install on every WP site I setup.
It work wonderfully and gives all the flexibility I need.
It handles pagination well.
It gives options to style the lists using custom CSS (some assembly required, batteries not included).

This should be in WordPress core! Don’t mean to take this away from Bill Erickson after all his great work, but I consider it essential!

I do need to create documentation for my end users to remind them where each category/tag listing shows up on their site, but that is true of most everything we do in site development that is flexible/custom.