While that is true, FreckledOne, it is extremely time consuming to draw everything out on paper and scan it if you don't have an industrial scanner. If you wanted to go the traditional route you would also have to buy, build, or improvise a light box.
You can certainly animate in a regular art program, preferably a program that utilizes layers, and import the still frames into a different program to test them, but it would be extremely difficult to try to edit and compile a multiple shot animation that way. Even a freeware animation program would be more accessible than that, and would probably save a lot of time.
And I have just the thing

:
http://www.pencil-animation.org/I have... actually used this program to animate a T-Rex before. Hmmm, coincidence?
That animation is here, if anyone would like to view it:
http://kelpgull.deviantart.com/art/Rexrun-302102665Again, I will compile an animation tutorial for anyone who is interested in trying out this amazing, fantastic, wonderful art form
