A.k.a. the Internet Archive wayback machine [http://www.archive.org/]: Frequently the only way of retrieving information on web sites no longer on the net.

Not Tcl-related (that we know), but often very convenient for digging up old stuff. If a link to some code here on the wiki is broken because the site has disappeared, then the info may still be up in this archive.

''[lexfiend] 16 Feb 2006'' - It's also useful for finding older versions of existing content (i.e. ''time-travelling'').  To find all archived versions of, say, http://www.scriptics.com/, simply go to http://web.archive.org/web/*/http://www.scriptics.com/ and take your pick.
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[Category Internet]