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Hmm... as sigil_beguiler pointed out, it's interesting that four of the settings in this thread integrate more advanced technology than is standard for D&D (I'm including LordofNightmares in with this total for the unique way that he chose to make technology conspicuously absent within his megacity of Danthalas). A trend, or just coincidence? :D

The world that I'd put together for another Setting Search probably wouldn't have technology developed past the level of a traditional D&D campaign, although I think I'd make use of magic in ways that might seem a bit like advanced technology. I don't normally run homebrew settings, so the world that I'd create isn't one I've played in before - or even one that's well thought out at this point. I have a lot of story ideas kicking around in my head, so I'd have to smash together a couple of my favorite and give the finished proposal as much polish as I could...

I snagged the War of the Burning Sky campaign from RPGNow, intending to drop it into my existing campaign somewhere, but it's gone high and right on me and become it's own world, following a storyline so off from the original published one as to be its own game.

There are 5 nations, one big the rest fairly small.
Orcs are the dominant culture. They are harsh taskmasters, but they are not brutes. Humans and most other goblinoids are second-class citizens, demihumans are third-class.
After the emperor (an orc, of course) was assinated by magical means, his overly ambitious advisor is rounding up arcanists who are less than loyal, even to the point of crossing borders and abducting them from their homelands. This has led to war.
The drow, having seen too many wars over their lifetimes, were not banished underground. They went of their own accord, trying to build a nation beyond war. However, surface people keep bringing their wars to them, so they had to become rather violent in their safeguarding of their peace. Any POWs are enslaved. They'll be released when the war is over. Think of a very aggressive Switzerland during WW2.
Gnolls are druids and rangers, nomadic and very tied to the land. They are doing their best to avoid getting involved in this war. Unlike the drow, they will aid any who need healing and will help refugees find the best paths to safety. In this war, they have taken in foundlings, so it's not unusual for a gnoll pack to have humanoid or demi-human children among their numbers.
The emperor pro temp has almost completed a super-weapon to use against wizards and other usiers of arcane magic. The only magic she will allow is divine magic, and only that granted through her deity. Her force of Inquisitors do her legwork (and her dirty work).

I had started to run this campaign as per the published adventures, but players are players, and they went in another direction, one which I found quite interesting. The orcs have made many important military victories, arcane spellcasters are hiding for their lives (I drew heavily on the Holocaust for this condition). The PCs don't know it, but the surrender of three of the four smaller nations is almost at hand, and elven nation of Shahalesti will stand alone.

To the north is a prison called Scourge Prison where arcanists are taken to have their loyalty tested. They never come back. The anti-magic superweapon uses the essence of arcana, also known as blood from captive mages, for it's power source. A new prison is being built in the south, and it's here that the game currently finds the PCs. They're going in to shut the operation down.

And their current level is only 3...

I would probably offer something like this, but with the stuff in italics changed around to avoid copyright infringement (and I may have missed some others). Rather than a world just emerging from war, this one has just stumbled into it. The rest of the planet is a wasteland after a meteor hit. Only an accident of geography sheltered this small peninsula, which was pretty isolated from the rest of the world to begin with. A session in which the PCs tried to cross the northern mountains to see about a foreign alliance with whoever might live there ended in the realization that those five nations were the only ones around. How the DM develops the wastelands is up to his or her fevered imagination.

I try to keep modern tech to a minimum. I guess my players prefer it too, or they wouldn't have stuck themselves on Xen'drik living with the natives. Of course, my players are the kind of guys who believe that "fast food" is anything you didn't hunt down, kill, and gut yourself.

Yes, macho out-doorsy men play D&D, too.:D