The Formation of Indo-European Languages From *PIE
The development of early Indo-European languages from a hypothetical Proto-Indo-European language may have come about in this order, according to Christopher I. Beckwith.
What Is Proto-Indo-European (PIE)?
Proto-Indo-European language (PIE or P.I.E.) is not an actual language but a reconstructed language that is presumed to be the ancestor of modern Indo-European languages.
In Search of the First Language
A Nova special looking for what would have been the language spoken before the Tower of Babel.
Knowing Words in Indo-European
Table shows a genealogy for two "knowing" roots, which in modern English turn up as "know" and "wit." Also a table of the words for "is" (to be).
Numbers in Indo-European Languages
Shows conjectures for numbers in the various proto languages of the Indo-European group: Celtic, Balto-Slavic, Italic, Indo-Iranian, Hellenic, and Germanic.
Instructions for Americans on pronouncing phonetic symbols.
The Study of Celtic Languages
From U.C. Berkeley, a look at the migration of the Celts and spread of their languages, and their relatively unstudied place in comparative linguistics despite their connection with the Italic languages.