The second you talked about etching knowledge for the future, I immediately thought of The Long Now Foundation's Rosetta Project -- which intends to etch lots of linguistic information onto small metal discs, with lots of copies floating around for redundancy. They're apparently having production problems, though. I believe the Long Now book actually muses about how a "civilization start up guide" might be something handy to put in a similar format, but don't have it around at the moment.

Out of curiosity, why uranium glass?

And going off on a tangent, does the entire Long Now Foundation and its projects remind anyone else of Hanson's "Dreamtime" concept?