For those of you who don't know, Andrew "KungFuSquirrel" Weldon (creator of NS_Eclipse and NS_Veil) is the project director of an extremely ambitious single-player mod/expansion for Half-Life, entiled HL: Nightwatch. Last night at midnight, the main site updated with an *avalanche* of new screenshots, concept art, and model renders.
Nightwatch's level design crew includes KFS as well as the talents of ken20banks (ns_nothing), tommyd (ns_tanith), and manah (ns_caged). Other mappers include Ekaj (upcoming ns_shaft), WhoMe? (creator of the SP episode "Someplace Else" and a work in progress, Parallax), ferret, and Badmofo (don't have any examples of their past work, but their Nightwatch stuff speaks for itself!).
Here's a teaser of what you'll see at the Nightwatch site: (These are shots of areas by Badmofo, KFS, and Ekaj, respectively)