NASA's Stardust spacecraft returned to Earth in January with the first samples ever retrieved from a comet. This briefing with mission scientists held March 13 from the Johnson Space Center offers an update on the initial research into the comet bits.
Source: NASA TV (37 min 55 sec Part 1 - QT 6 Dialup file)
Download this clip to your hardrive.
(Windows users right-click this link. Mac users control-click this link)