I found this great source of tips and tricks in Kiel Figgins website. The one that I liked the most is a little script to actually create a key on an f-curve without disrupting it. This is a great way to add a key whenever you want to keep a certain pose that you got by adjusting the tangents.
Here's the link to the Tips page, and this one is for the adding key script.
P.S.- Some of the tips are a bit old, but still good. Some, like the euler filter, has been already implemented in Maya (in Graph Editor\Curves\Euler Filter).