http://www.blackmesasource.com/index.php
I've been looking at this for a while now (and by a while i mean about 2 years xD ). It's the original half life in the Source engine not the old quake engine.
There slowly realising new media all the time and it's really starting to look amazing. I suggest you look at some of the screenshots and videos, they brought back some memories for me.
Can't wait for it to be released!
![[PUPPY]](images/smilies/Puppy.gif "[puppy]")