This page would look a lot spiffier if you downloaded a standards compliant web browser.

Sketching Annotations in a 3D Web Environment
    ACM Conference on Computer Human Interface 2002
    abstract:
    Collaborative design review is an important part of architectural design work. The Space Pen system supports annotation and drawing on (and inside) 3D VRML/Java models using a regular Web browser to exchange text and sketched annotations for review.