Building a 3D game is a time consuming job. With the right people and tools however a simple game demo like shown on this page can be written in a few days. Remember that besides coding creating the 'assets' (3D models, sounds, images) is a large part of the total investment.
The demo will be playable from within the browser if the Unity3D plugin is installed or a standalone version can be downloaded for Mac OS X (here) or Windows (here). Source code (project files) can be found here.
The models used for this demo are mainly reused from the TuinPad game, a few models are modified public domain models. So, basically if a model is nice, it's probably made by Aram from StudioAlarm, if not than it's probably me stumbling whith Cheetah3D and some simple paint program.
A simple test about loading webpages within an unity game can be found here.
Demo version: 0.12, 21-August-2008. The project files (source) can be found here (needs Unity3D 2.0).