Black Mesa: A Half-Life 2 modification
In case you live under a rock, this mod is recreating the original Half Life in the Source engine, and it looks
extremely good. I check in every few months, as media releases are pretty rare, but I've been reading blogs and whatnot on the site for the last half hour or so and it seems like they are getting pretty far along.
I couldn't be more excited for this release. Probably more so than for most games. It'll still probably be a while before it comes out though.
In case you don't think they're that far: "We carefully pick the things that can be shown for each media release, and only show those things. This is in direct contrast to what most of you seem to think, which is that what we have shown is everything we have done. That is simply not true."