Anyway, I ran into Waldo Tobler in the hall yesterday, and he mentioned a couple of things he'd done. To start:
Tobler (2002), Global Spatial Analysis
Tobler (2001), Spherical Measures without Spherical Trigonometry
...also, the Ping group has a survey of globes...
Thorne (2003), Earth's Avatar: the web augmented virtual earth
...and the NCGIA has a bibliography on geobrowsers.
...and the Discrete Global Grids book...