Here on Postcards, you’ll find a trove of video segments from last week’s Fortune’s Most Powerful Women Summit. Click here to watch a riveting take on the fall of Lehman Brothers by Barbara Byrne, a vice chairman who spent 28 years at the now-bankrupt firm. Today, since Barclays bought Lehman’s North American core, Byrne is a vice chairman at Barclays Capital .

We also just posted the first of several highlights of my Summit interview with Melinda Gates, the lesser-known half of the world’s most generous philanthropic couple. As I noted in a Fortune cover story on Melinda — her first profile, which appeared in January — she and Bill will almost certainly give away more than $100 billion in their lifetimes. Already they’ve disbursed more money than the Rockefeller Foundation since its founding nearly a century ago. And now, with their pal Warren Buffett’s fortune in their fold, they’re just getting started. Click here to see Melinda Gates talking with me about how to fix U.S. education.

The Summit, unlike Fortune’s other confabs, is off the record. So what’s with all this video footage? Some of our speakers and panelists, including Gates and Buffett, agreed to let us share their sessions with you. Just in case you want to catch up on our fascinating last week, here’s the trove of video from the 2008 Summit:

Warren Buffett on the financial markets, General Electric , and the power of women:

  • Anatomy of the GE deal. Click here.
  • Economic Pearl Harbor.” Click here.
  • “Our system works.” Click here.
  • On gender equality. Click here.
  • Build economic confidence. Click here.
  • An alternative plan. Click here.

Meredith Whitney, Oppenheimer & Co. bank analyst, recent subject of a Fortune cover story, and No. 35 on the 2008 Fortune Most Powerful Women list — on Citigroup and the market mess:

  • Big blow to Citi. Click here.
  • Bailout doesn’t make sense. Click here.
  • To the aggressors go the spoils. Click here.

Arianna Huffington, co-founder and editor-in-chief of the Huffington Post:

  • Media and the election. Click here.

Deborah Wright, president and CEO, Carver Bancorp :

  • Sidestepping the credit crisis. Click here
  • Safe money. Click here.

Martha Stewart:

  • Can women have it all? Click here.
  • Crafts and the credit crunch. Click here.

Kathleen Murphy, CEO, U.S. Wealth Management, ING :

  • Panicking never helps. Click here.
  • Cracks in the glass ceiling. Click here.

And coming soon on Postcards: more highlights from the Summit and other women on this year’s Fortune Most Powerful Women list.