Black Mesa Source

http://blackmesasource.com/

Black Mesa is a complete re-creation of the game Half-Life, utilizing the Source engine. Black Mesa will let you re-visit the world that started the Half-Life continuum.
The screenshots look good and there will be a multiplayer component but news of progress is about as elusive as that of Half Life 3. :(
What Happened To Black Mesa: Source?

Incredibly there was a cogent interview in RPS with a Black Mesa Dev

http://www.rockpapershotgun.com/2012/05/09/interview-what-happened-to-black-mesa-source-part-1/

http://www.rockpapershotgun.com/2012/05/10/what-happened-to-black-mesa-source-part-two/

What a relief from perusing the BMS Forums :P
Between this and H&J I've given up. Does no one understand what "soon" means?
Valve does :P

A video of actual gameplay
http://www.shacknews.com/article/75161/black-mesa-gameplay-trailer-leaked
Ooooooo.

Well I'll be damned!

http://www.blackmesasource.com/
12 days !!!!!!! They are releasing the game completed to the end of the Lambda Core. The last chapter with Xen and death match format will be released at a later time. No date given. Still, I'm looking forward to it :)