I know, a day late, but since I see no topic up around here, well I think it deserves Recognition.
For those of you who don't know, Black Mesa Source was a remake of the original Half Life into the new source engine, which they believe that Valve didn't do a good job in it's Half Life source remake (I also believe that as well).
Anyway - I will say that I am about half-way through the game and am very impressed, and I am happy to say that this mod will entertain me for a good long while.