The long awaited Source engine remake of Half-Life is finally due to see its first released on the 14th of September. The Black Mesa website has been replaced with a simple countdown timer with twelve days left on the clock. Clicking a fold at the top right of the page takes one to a copy of Gordon's conformation of employment letter from the original Half-Life manual, but with the signature altered from "LM" to "tb".
The team leader, Carlos Montero, clarified on the forums that the team are still working hard on Xen and the multiplayer portion of the mod and that this release will be an approximately ten hour campaign spanning Gordon's Black Mesa commute all the way to the Lambda Core.
The full soundtrack has been put up for download to whet your appetite for the mod and other than listen to it on a loop until the 14th there's not much you can do but wait until the first release becomes available for download.