There has been a lot of discussion on this here — it’s faintly embarrassing how many different project galleries we’ve accumulated, so I feel a bit bad about even mentioning the possibility of yet another, but, I do have a domain I haven’t done much with, designinto3d.com which might be well suited for this.
I was thinking I could launch it as a Kickstarter, with an associated book, since I know book publishing better than anything.
Or, everyone could just post their designs and source files to:
http://carbide3d.com/projects/
or
http://community.carbide3d.com/c/gallery
or
http://www.shapeoko.com/projects/projects.php
or
http://www.shapeoko.com/wiki/index.php/Projects
or
http://www.shapeoko.com/forum/viewforum.php?f=30
or
http://www.shapeoko.com/wiki/index.php/Online_resources#Plans_for_Projects