Consider: As I understand it, the wiring in the Golden Gate Bridge, if layed end-to-end, would stretch around the globe three times over. Considering the circumfrence of the earth is something like 40,000km, that would mean that we've already built bridge structures that incorporate over 100,000km of cabling. Granted, the design of the space elevator is completely novel; but this stuff is based on modern engineering understanding.
"A circumnavigational flight sounds great, it just seems far-fetched. An 852 foot test. Only 131,472,000 more feet to go."
-- Overheard circa 1903
http://science.slashdot.org/article.pl?sid=06/09/27/129238&from=rss
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