Here are a couple links for some 3D models.

Form Fonts (pay - but well worth it)

General site (and commercial models):
http://www.formfonts.com/index.php
Free stuff:
http://www.formfonts.com/search.php?area=1&site=&query=gratis&submit2=Submit
Exchange:
http://www.formfonts.com/index.php?area=All&site=1
(please, read the info prior to uploading)
http://www.formfonts.com/information/Xchangeguidelines.pdf

Entourage Arts (pay - but well worth it)
http://www.entouragearts.com/

Herman Miller (select Product Category)
http://www.hermanmiller.com/CDA/SSA/...4-c996,00.html

Steelcase (find a product, click Furniture Symbols link)
http://www.steelcase.com/na/products.aspx?f=10007

Knoll (must download entire Furniture Symbol Library)
http://www.knoll.com/products/fsl.jsp

Kohler (must download entire CAD Symbol Library)
http://www.us.kohler.com/tech/cadsym...=1&nitem=link8

E-Interiors (membership required. Choose a product category, search "3D" for CAD Library Availability)
http://www.e-interiors.net/index.php...guage=en&ris=2

Evermotion (membership required)
http://www.evermotion.org/index.php?unfold=free_stuff

Turbosquid (membership required)
http://www.turbosquid.com/Search/Ind...tMaxResults=50

HOWE (click 2D/3D link)
http://www.howe.com

Design Mebel (Russian, requires .RAR decompression program)
http://www.designmebel.ru/library_for_designers_eng.htm

Alexey Skoldinov (Russian)
http://www.skoldinov.spb.ru/obj.php?lang=en

Wolf Range Company
http://www.wolfrange.com/CADFrm.htm

SubZero Appliances
http://www.subzero.com/subzero/subzerocad.asp

Vulcan Hart
http://kclcutsheets.com/vulcanhart/Default.asp

True Food International
http://www.truemfg.com/TFI/KCLFrameset.asp

Swedese (click Products link, then Download CAD Object)
http://www.swedese.se/

Skandiform
http://www.skandiform.se/English/

Sanitec Kolo (choose a product beneath the Technical Drawings menu)
http://www.sanitec-kolo.com/kolo/kolo_pliki.html

Reichenberg Weiss (click a product icon at the top, then at the bottom)
http://www.reichenberg-weiss.de/htm/prod.htm#

Kinnarps
http://cadsymbol.kinnarps.se/html/en/start.html

Lammhults
http://www.lammhults.se/?id=935

Johanson Design
http://www.johansondesign.se/products/cad/

Humanscale
http://www.humanscale.com/download_library/index.cfm

Horreds (click Products/references)
http://www.horreds.se/en/iCM.aspx?PageId=1

Creative-3D
http://www.creative-3d.net/free3D.cfm

GE Monogram (on a product's page, click Manuals & Documentation)
http://www.monogram.com/index.htm

Fagerhult Lighting
http://www.fagerhult.com/default.asp.../menu.html&b=S

Eurobib
http://www.eurobib.com/Default.aspx?ID=3194

Euromodul (Russian)
http://www.euromodul.ru/html/_3dmodels.htm

Model3D.biz (thx James)
http://www.model3d.biz/obj/?did=21&iid=0

Max-Realms Requires Login
http://www.max-realms.com/modules/wmpdownloads

KraftMaid Framed Cabinetry Requires Login
<!-- m --><a class="postlink" href="http://www.kraftmaidspec.com/specbook/index.cfm">http://www.kraftmaidspec.com/specbook/index.cfm</a><!-- m -->

ArchiBASE
<!-- m --><a class="postlink" href="http://www.archibase.net/gdl">http://www.archibase.net/gdl</a><!-- m -->

Enkeboll Designs
<!-- m --><a class="postlink" href="http://www.enkeboll.com/2DLA/start.htm">http://www.enkeboll.com/2DLA/start.htm</a><!-- m -->

Great Buildings
<!-- m --><a class="postlink" href="http://www.greatbuildings.com/types/models/spatial_models.html">http://www.greatbuildings.com/types/mod ... odels.html</a><!-- m -->

White River Moulding (2D acad files)
<!-- m --><a class="postlink" href="http://www.mouldings.com/products.shtml">http://www.mouldings.com/products.shtml</a><!-- m -->

Computer component collection
<!-- m --><a class="postlink" href="http://scc.jezmckean.com/">http://scc.jezmckean.com/</a><!-- m -->

Play equipment (thanks Toby)
<!-- m --><a class="postlink" href="http://www.kompan.com/sw34163.asp">http://www.kompan.com/sw34163.asp</a><!-- m -->
(Link to the post - and details)

Free PR People and Tree Cutouts (thanks to Stu Mayhew for the heads-up)
Vyonyx. (Navigate to the downloads section.)

3D Nature's Components for SketchUp (commercial)
A variety of "face me components"
http://3dnature.com/sketchupcomponents.html

Visa Lighting
Light fixture models with IES info (thanks "Fletch")
http://www.visalighting.com/

Cadyou: Free 3d Models, Cad Blocks and Textures (thanks "Decipher")
<!-- m --><a class="postlink" href="http://www.cadyou.com/">http://www.cadyou.com/</a><!-- m -->

"Kropped.com" growing number of cutout people and such fro 2D, "Face me" components as well as PP work (thanks Roger Barnes)
<!-- m --><a class="postlink" href="http://www.kropped.com/">http://www.kropped.com/</a><!-- m -->