QUOTE(animas3D @ Jan 6 2010, 11:25 PM)

I was reading about selection filters, although I never tried them yet and still don't really now what they are. I assume that they are kind of like groups? What kind of scenario would one use them.
Many times you will want to temporarily isolate your attention on some set of bones. Fingers. Arms. Face controls. Head, neck and spine. Any set that if you're editing keyframes on one, you probably need to edit the others at the same time.
But the PWS always lists all the bones in alphabetical order and not in related groups. "upper arm" and "lower arm" won't appear next to each other. "Pinky, ring, index, little" finger names wont appear next to each other.
In TSM2 almost everything is prefixed with a digit and a "left" or "right" which makes them hard to quickly scan for bones you want.
You
can CTRL-select any set of bones and they will appear together in the "Timeline" window, but you have to scroll around and hunt them down every time you want this.
Selection filters lets you define any arbitrary group you want appear to by itself in the PWS timeline and it's recallable with one click.
Left fingers. Right fingers. Lips. eyelids. eyelids and eyebrows. eyelids and eyebrows and lips.
Once you've brought up your group you can easily shift its keyframes around without grabbing something unrelated. You can quickly shift select the top and bottom to key them all at once.
It speeds up the keyframe animation process.
If you're only animating 5 bones on a character, this won't seem like a big deal. But when a character has 100+ bones keyed in the chor to wade thru, this is a big deal.