Biden on CBS:

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Biden on MSNBC:

Biden on MSNBC (follow-up):

Biden on CNN:

Where’s Sarah?

This ABCNEWS note may explain it:

But there was a difference: Democrat Joe Biden made the round of post-debate television shows. NBC and CNN said they invited McCain’s running mate, Alaska Gov. Sarah Palin, who has granted only three interviews since joining the ticket a month ago, but she declined.

Palin: “Thanks, but No Thanks on those Post-Debate Interviews.”

Confirmed by the NYTIMES:

After Barack Obama and John McCain stop talking on the debate stage Friday night, their surrogates will start spinning. But one high-profile supporter of Mr. McCain will be missing: his running mate Sarah Palin.[...]

Ms. Palin is scheduled to be at a debate-viewing event in Philadelphia, covered by a limited group of reporters, and she is not listed by any networks as a post-debate guest. On NBC and CBS, the former Republican presidential candidate Rudy Giuliani will be commenting on the debate performances.

UPDATE:
SARAH PALIN FOUND

She was at a bar!

Palin grabs a seat at the bar | Philadelphia Daily News | 09/27/2008

Perhaps it was coincidence that the song “Everybody Wants to Rule the World” was playing as Republican vice-presidential candidate Sarah Palin worked the crowd at the Irish Pub last night.

…

Palin did not take questions from reporters nor did she talk policy. She posed for pictures and chatted with supporters, many of whom were from outside the city limits, and made an approximately minute-long statement.

From the NYTIMES: