After working for a while on a feature that involves looking at a number of files, I end up with a decent buffer list. I will have inevitably edited a few of those files and occasionally I'll inadvertently leave one of the buffers modified. Instead of opening the buffer list (:ls), finding the modified buffer, and navigating to it, I can just jump straight to it. I can do this with :bmodified or just :bm. This jumps straight to the next modified buffer. If there is no modified buffer, it tells me No modified buffer found.

See :h bmodified for more details.