Hi Mike,
I'm wondering whether we should add google maps and virtual earth to the Services list [1], but as sub points under GeoWebCache. The question pops up occasionally, and although they're a bit light weight compared to the other stuff there, this seems like the best place to introduce them. Could just copy over the relevant pages from gwc's trac.
-Arne
1: http://geoserver.org/display/GEOSDOC/Users+Guide
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Arne Kepp
OpenGeo - http://opengeo.org
Expert service straight from the developers