Got curious and did some searching ... actually kind of suprised at some of the keyword domains for 3D that are not taken. The list below are all available as of this post, and all have exact match search volume worth noting (some in the tens of thousands of searches per month.)
Some points worth mentioning:
1)Wherever possible I used this hierarchy: .com, .net. .org, hyphenated .com (three words or less) .info, hyphenated .net (two words only) and then all other TLDs. So in some cases, if you see a .com listed chances are it's available in the other TLDs as well -- just didn't bother listing it for obvious reasons.
2) A lot of the search volume for 3D stuff is not so much about advanced technology as it is about currently-available 3D products. While not nearly as sexy as Chicks On TV That You Can Actuall Motorboat™ my feeling is that a person who wants 3D unicorn wallpaper and 3D art for his kid's bedroom ceiling is a natural foot traffic type for any other 3D stuff that comes out in the future. What I mean is, if you're serious about getting in on the "3D groundfloor" you might want to start with the existing traffic, not the future traffic.
3) I tried to eliminate all trademark domains and domains that contained trademarks in any context. Many are available in many TLDs
4) Ditto extreme adult stuff (incest, loli, that kind of thing.) No interest in reprinting them here, but they're out there if you want to go digging for them.
Frank
FREE3DMOVINGBACKGROUND.COM
FREE3DDESKTOPWALLPAPER.COM
3DANDDIGITALWALLPAPERS.COM
3DMODELFEMALEVIRTUAL.COM
3DCELLMODELPROJECT.COM
FREE3DDESKTOPBACKGROUND.COM
3DTENTACLES.COM
3DCHRISTMASCAROLMOVIE.COM
FREE3DCOMPUTERWALLPAPER.COM
3DDOLPHINWALLPAPERFREE.COM
3DHALLOWEENWALLPAPER.COM
3DFREEWALLPAPER.COM
FREE3DBACKGROUNDSANDWALLPAPER.COM
FREE3DDRAGONWALLPAPER.COM
3DDRAGONWALLPAPERS.COM
3DFAIRIESWALLPAPER.COM
HALLOWEEN3DWALLPAPER.COM
3DHALLOWEENDESKTOPWALLPAPER.COM
MOVING3DWALLPAPER.COM
3DSKULLWALLPAPER.COM
3-DSUNVIEW.COM
3DFREEWALLPAPERDESKTOP.COM
3-DBEADEDCHARMS.COM
3-DSIDEWALKART.COM
3-DMONSTERPORN.COM
3DBACKGROUNDSANDWALLPAPER.COM
3-DALIENSEX.COM
3-DCARTOONSEX.COM
3-DPERIODICTABLE.COM
3-DTATTOOS.COM
3-DKIDSROOMCEILINGART.COM
3-DWALLPAPER.COM
3DBABESWALLPAPER.COM
3DCGWALLPAPER.COM
3DUNICORNWALLPAPER.COM
3DWALLPAPERDINOSAURS.COM
FREE3-DSEXGAMES.COM
3-DCAMERAMAKER.COM
3-DCONCRETEWALLS.COM
3-DSTARS.COM
HAUNTEDHOUSEWALLPAPER3D.COM
FREE3-DANIMEPORN.COM
FREE3-DHOMEDESIGN.COM
WOODEN3-DPUZZLESTOYS.COM
3-DALIENMONSTERCARTOONTUBES.COM
3-DCAMERAEQUIPMENT.COM
3-DBABES.COM
3-DBEADEDBELLPATTERN.COM
3-DPICTUREMAKER.COM
CARTOONPORN3-D.COM
FLYMETOTHEMOON3-D.COM
HOWTODRAW3-DROOM.COM
MISSILE3-D.COM
PROCESSOFMAKING3-DGLASSES.COM
3-DARCHITECTUALDRAWING.COM
3-DBLOCKS.COM
3-DBUTTERFIESTHATYOUMOUNTONTHEWALL.COM
3-DCUT-OUTGLASSES.COM
3-DLESBIANHENTAI.COM
3-DOBJECTS.COM
3-DSEXVIDEOS.COM
3-DTOONS.COM
3DAQUARIUMWALLPAPER.COM
FREE3DCHRISTMASWALLPAPER.COM
HOWTODRAW3-DLETTERS.COM
3-DHENTAIPORN.COM
3-DHOMEPLANS.COM
3-DMODELOFANATOM.COM
3-DSKELETON.COM
3-DANIMATEDPORN.COM
3-DANIMATIONWEBSITE.COM
3-DFUCK.COM
3-DLOCKDESKTOPICON.COM
3-DPAINTING.COM
3-DPICTURESCOMPUTER.COM
3-DSCHOOLPROJECTS.COM
3-DTRILATERATION.COM
FREE3DANIMATEDWALLPAPERS.COM
FREEDESKTOPWALLPAPER3D.COM
FUNNY3DHALLOWEENWALLPAPER.COM
GEOMETRY3-DFIGURES.COM
HIGHRESOLUTION3DWALLPAPER.COM
HOWTOMAKEA3-DMODELOFANATOM.COM
MILF3-DCLIPS.COM
WERTHS3-DWFPFIBERPROBESENSOR.COM
3D1440X900WALLPAPER.COM
3DSPACEWALLPAPERS.COM
DESKTOPWALLPAPER3D.COM
FREE3DWALLPAPERDOWNLOADS.COM
3DABSTRACTWALLPAPER.COM
GOTHIC3DWALLPAPER.COM
MARINECORPS3DWALLPAPER.COM
3DANIMATEDWALLPAPERS.COM
3DMOBILEWALLPAPER.COM
3DNUDEWALLPAPER.COM
3DWALLPAPERCHRISTMAS.COM
COMPUTER3DWALLPAPER.COM
FREE3DCHRISTMASWALLPAPERS.COM
LIBRAWALLPAPER3D.COM
3DDESIGNWALLPAPERS.COM
3DILLUSIONWALLPAPER.COM
3DNAUTICALWALLPAPER.COM
3DWALLPAPER1024X768.COM
3DWALLPAPERSITES.COM
ALIEN3DWALLPAPER.COM
HD3DWALLPAPERS.COM
SURREAL3DDESKTOPWALLPAPERS.COM
WALLPAPER3DSPACE.COM
3DBACKGROUNDSWALLPAPERS.COM
3DCARTOONWALLPAPER.COM
3DCHRISTMASWALLPAPER.COM
3DDESKTOPWALLPAPERSFORCOMPUTERS.COM
3DDOLPHINWALLPAPERMAIMI.COM
3DGOTHICWALLPAPER.COM
3DHEARTSWALLPAPER.COM
3DPLANETWALLPAPER.COM
3DSEXYWALLPAPER.COM
3DWALLPAPERBLACK.COM
3DWALLPAPERROSES.COM
3DWALLPAPERSPRINGFLOWERS1024X768.COM
3DWALLPAPERSTARWARSCLONEWARS.COM
BEST3DWALLPAPERSFORCOMPUTER.COM
FREEWALLPAPERS3D.COM
SEXY3DFANTASYWALLPAPERS.COM
ACHRISTMASCAROL3D.NET
3DDOLPHINWALLPAPER.NET
3DDESKTOPBACKGROUNDS.NET
FREE3DSEXGAMES.NET
3DSNAKE.NET
3DMOM.NET
3DFAMILYCOMICS.NET
3DFUTANARI.NET
3DGEOMETRICSHAPES.NET
FREE3DANIMATION.NET
FREE3DHENTAI.NET
3-DSEX.NET
3-DHENTAI.NET
COOL3DWALLPAPERS.NET
FREE3-DPORN.NET
3-DPUZZLES.NET
3DCOMPUTERWALLPAPER.NET
3-DBUTTERFIESWALLART.NET
3DDESKTOPWALLPAPERS.NET
WALLPAPER3D.NET
ACHRISTMASCAROL3D.ORG
3DDOLPHINWALLPAPER.ORG
3DCOMIX.ORG
FREE3DPORN.ORG
FREE3DSEXGAMES.ORG
3DFUCK.ORG
3DSHAPES.ORG
3DBOOBS.ORG
3DSNAKE.ORG
3DPORNCOMICS.ORG
3DMOM.ORG
3DFAMILYCOMICS.ORG
3DFUTANARI.ORG
3D-COMIX.COM
3DDESKTOPWALLPAPER.INFO
3DHENTAI.TV
---------- Post added at 07:48 PM ---------- Previous post was at 07:45 PM ----------
Ack, I'm tired. Also note:
5) "3-D" is a whole other realm of search. It doesn't get nearly the search volume as "3D" but it certainly gets enough to warrant attention. In a similar vein, the reason there are so many wallpaper domains is that "3D wallpaper" gets nearly a quarter of a million searches per months, which I thought was enough to warrant drilling down into the long tails a little.