Displacement subdivision surfaces
2000 - Hugues Hoppe
This article describes how to overlay a displacement map on a subdivision surface in order to get a higher detail mesh. It also gives an overview on how to generate the subdivision surface and displacement map from a high detail 3D mesh.
Fast Rendering of Subdivision Surfaces
Implementing Subdivision Surface Theory
February 2000 - Brian Sharp
Subdivision for Modeling and Animation
This article is very heavy on the mathematics, but also gives very detailed information on different sub division schemes. It gives explanation for how the schemes can be modified to allow sharp or semi sharp creases without increasing the control mesh.
Subdivision Surface Theory
April 2000 - Brian Sharp
This article describes the theory of a couple of sub division surface schemes, modified butterfly and Catmull-Clark.
Incredibly Dense Meshes
April 2002 - David Brickhill
This article basically gives an idea for how loop subdivision surfaces and compression through wavelet transform can allow for use of ultra high detail meshes. It also briefly explains how the techniques can be implemented.
Practical Implementation Techniques for Multi-Resolution Subdivision Surfaces
2001 - David Brickhill
This article shows how to render Loop subdivision surfaces in a fast way by avoiding recursive calls. The surfaces are used for character rendering and thus supports skeleton based animation, multiple textures, etc.
At the time the article was written the algorithm was patent pending, but the company filing the patent has since closed without concluding the process.