In the PWS or the "Timeline" window click on the small red,green,blue icon at the bottom of the right pane.
This turns on the curve view.
If you have "Show bias" (same icon as for modeling mode) turned on you can manually adjust the slope of a selected CP.
you can also group select several CPs and set their slope in the menu or by using the 7 8 9 0 keys at the top of the keyboard.
You can also use P or O to peak or unpeak CPs, like in modeling mode
my Keyframe basics vid covers a bit of this. See the screencam tuts link in my signature.