It was already a steal at it's original price of $4.99
, but if you are interested in classic, older first person RPG's this is a good one to get. The store page on Steam has some good screen shots and a basic summary of the game. Those who played it back when it was released may remember the fair number of bugs it had, but much of that has been patched over the years. It's an old school dungeon crawl with plenty of crafting and a decent character "skill tree" development system. Here's the link on the Steam site, you need to be a Steam user to download it, but can still access the webpage to view the description through your normal browser.
http://store.steampowered.com/app/1700/They also have a bunch of Quakecon specials going on Bethesda releases, so good time to check out the prices on Elder Scrolls games if you don't already have them in your library and are a Steam User.