Sadly, this article isn't about a Zork remake (not that a text-only game would benefit from bump mapping or bloom lighting) -- I just needed a catchy headline that would attract text adventure enthusiasts. If the phrase "You are likely to be eaten by a grue" doesn't mean much to you, you should do a bit of homework (I would also suggest a personal favorite, Aisle).
If you are a text adventure enthusiast (or even just a "Hey! That's cool!" enthusiast), you'll be delighted to know that the Reign of Grelock (beta) is available as an online Flash game thanks to Chris Marjason. The game can be found in its original glory at a computer terminal in the Hubris Comics' offices in Fallout 3. Reign of Grelock is pretty short, and you won't get any bonuses for playing it (in Fallout 3 or otherwise), but it's a neat homage to ye olde school of text-only parser game design.
Because the game was remade in Flash, options are clickable, Marjason having done away with the text inputs. Nevertheless, he kept the computer terminal border and fixed some of the original's glitches. If you're feeling nostalgic and have ten minutes to kill, click here to give Reign of Grelock (beta) a whirl.