A pretty slick 3-level scenario based in a city... pay phones work just like they do in real life (which means not all that often). New monsters, lots of new textures, great gameplay... try it, you'll like it.

A single level demo of the upcoming scenario, Gates of Fenris. Comes with a shapes patch, which doesn't seem to do much (except make the "slanted floors" hack look right).

A 7 (or 3, if you only count the action levels) level scenario. Nice attention to detail, it'll keep you on your toes. There are always shots coming from somewhere...

An enormous 6-level total conversion. (Well, okay, not total... and that's its biggest weakness.) The mapmaking is pretty good, and the new creatures are quite cool ...