Most are gone, but there seems to still be a few left up. No idea why.

Several geocities archive projects have collectively been hosted at reocities.com. A bit redundant in this case but for example http://www.reocities.com/tablizer/science.htm

This is not an answer, but there is a previous discussion in a submission of mine: http://news.ycombinator.com/item?id=4136682