I looked a bit more and found this one too, which also lists the oxygen permeability values (Dk):
clspectrum.com/article.aspx?article=103168
It's comparable to the site that disappeared.

Also I found this:
therightcontact.com/contact/search_softlens.php
which is a huge database you can search in; it also holds the Dk values and more.

And this:
sterlingint.com/softgeneral.php
which is some general information about contact lens materials. It explains why high water percentage is not always better: it makes the lens less durable. That's why silicon hydrogel lenses only hold a moderate amount of water: the Dk value of the material itself is higher than water.

Note that these sites list the Dk values but not the Dk/t values, which is the ogygen permeability when lens thickness is taken into account. This is just as important for oxygen permeability. The 2nd site does have a field for Dk/t but it's empty everywhere.

So, I hope it's of use to anyone! (And may these links pop up higher on the search engine results.)

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PS Can somebody eligible make my links clickable? Thanks.