The Ur-Quan Masters (formerly Star Control 2). It’s fun just as a space exploration sim from a pre-3D accelerator days, but the fact that the aliens you interact with are hilarious both in what they actually say and the voice acting in which they say it makes it a treasure.
I just found one of my favorites from a few years ago.http://www.fun-for-free.com/moorhuhn.htm
I can’t download here from work, but as soon as I get home - It’s Moorhen night!
Sadly, no, unless my google-fu is failing. Its in that limbo where its not new, but also not yet a classic, so that Atari page is likely the only place to get it, unless you Ebay(which is how i got my replacement copy).
Oh! Another game i remembered. Not old, but little known. Weird Worlds: Return to Infinite Space. Its a small Indy space exploration/RPG game built on the premise of low time commitment… Games only last a half hour at most. The universe always has the same set pieces, but they are randomly placed every time so you don’t know where things will be. It also has a quirky sense of humor.
You must be a lot of fun at parties.
For survival- horror FPS I’d offer a guarded recommendation for S.T.A.L.K.E.R.: Shadow Of Chernobyl. Guarded, because the game needs to be modded for you to get the most out of it. I’m playing it with the Oblivion Lost mod which fixes a lot of things that were wrong with the original. There are still a few glitches which may or may not break the game, but it’s worth it for the creepiness alone.
There is also the recent sequel S.T.A.L.K.E.R.: Clear Sky but it’s less creepy and more shooty, and still quite buggy.
I have an unhealthy fascination with the atmosphere and design of S.T.A.L.K.E.R. - Shadow of Chernobyl and the modding community really extends the game’s replay value, for that I recommend the Oblivion Lost, a good “realistic” mod with many added/reintroduced elements to gameplay or Priboi Story mod, which completely rewrites the game’s story.
ETA: That’s amazing! Not really a simul-post but pretty close given my internets slooowness. 
Only the greatest game in the history of mankind: Sea Rogue
Great minds and all that. 
It really is the atmosphere that makes the game. There have been a few times where I went to boot it up, only to decide that I didn’t want to deal with the ensuing jitters. I’ve only played a little of Clear Sky, but it seems positively sunny by comparison, and I keep putting it aside.
Imperium Galactica II: Alliances - This game is by far the best I’ve tried in the Galactic empire building genre. It doesn’t get nearly the credit it deserves.
Centurion: Defender of Rome also goes way unappreciated.
My roommate rented The Warriors as a joke and we ended up buying it, then buying and seeing the actual movie it was made from.
I have a lot more, I’ll come back when I remember them.
Yeah, The Warriors is not a PC game, I need to learn to read for comprehension.
Along these same lines, Freelancer, Space Rangers, and Space Rangers 2 may be worth a look, though SR 1&2 uses Starforce protection – though Starforce didn’t have any noticable effect on my own system, and it was easy enough to get rid of once I was done playing, there are many horror stories out there about it from other less fortunate people.
Now I’m going to have to dig it out and see if I can get it to run on Vista. Thanks 
Oh, youtube video of the scene I spoilered above: Epic low-speed chase
Planescape Torment is one of the best games I’ve played in any genre on any platform. Ever.
It’s an RPG but with a very heavy emphasis on story telling, but not in an “interactive slide show” JRPG way (which I hate). If you can find it I recommend you check it out, it’s simply amazing.
I’ll see your tricycle chase, and raise you the link to the scene which I was referring to:
Some of you guys have interestesting ideas about what “little known” means 
Babo Violent 2 is quite simply the best multiplayer game ever. Ever.
ETA: Except Quake 1 and maybe Unreal Tournament 2003. No story or plot, though. And I do mean no story or plot.
Well, to be honest, I knew of the No On Lives Forever games, but I’ve never given it much thought of playing. Now that I saw the tricycle chase, I simply must have it.
I’ve downloaded Ghost Master. It looks nice, and had me entertained for a few hauntings, but I fear that the game gets a it repetitive. Should I hang on to it, or can I expect to see more hauntings where I bind my ghosts to certain areas and up their powers until every sorority girl has run away?
PS:T I played so much that I think I know each quest by heart.
Certainly not the most obscure game out there, but if the idea of a text-based pro football management simulation interests you (that is, if you really enjoy Franchise Mode in the Madden games), I absolutely recommend Front Office Football. Taken as a whole, the FOF series is probably my favorite game ever, PC or console. I’ve spent literally months of my life building NFL dynasties, managing Hall of Fame careers, scouting prospects, etc. There’s also a vibrant multi-player community, which is *huge *fun.
Their college football sim is also great fun, but is badly in need of an update.
If old-school text adventure games are more your speed, check out Photopia. It’s really more of an interactive novel than a game, but the way the story unfolds is truly a work of art.
I played that about a year after it came out.
It’s a truly beautiful “game”.