On stage at Fortune’s Most Powerful Women dinner in Silicon Valley, I interviewed Yahoo (YHOO) CEO Carol Bartz.

Approaching two years in the job, Bartz has slashed costs and improved Yahoo’s profits, but she’s seriously under the gun to get revenues growing and up the company’s game against Google (GOOG) and social sites like Facebook.

In an interview last January, Bartz graded her job performance “B minus.” What grade does she give herself now? Bartz was typically candid and funny in assessing herself. Here’s a video clip from the Tuesday evening interview:

[cnnmoney-video vid=/video/technology/2010/12/01/mpw_bartz_yahoo_ceo.fortune/]

And here is Fortune’s story about my interview with Bartz.