Huh? What?
To commemorate the departure of Jon Stewart as host of The Daily Show there is a 42 days long stream of old episodes.
Where?
Here.
Can I watch it?
What year is it?
As of the latest edit; We've entered the post 9/11 world. See this (estimated) schedule for more updated info.
Why?
To see a cultural phenomenon take shape and see the start of comedy greats as Vance DeGeneres, Adrianne Frost, Bob Wiltfong, and many others. (Or if you're so inclined; Steve Carell, Stephen Colbert, Ed Helms, and many others.)
Is it funny?
I better. Or, well, someone better.