A small help from the Apple Core community

Hello folks

For a class presentation, I am making one on Apple on how they have forayed into new and diverse categories disrupting products both from other companies and their own and how they have connected with consumers on an emotional level.

No, I am not asking anyone here to make the presentation for me :P

I just wanted some pointers like what are the various categories Apple has forayed into with what success.

I would also like if someone could give links to some short videos (excerpts from Jobs' keynotes) on how he introduces Apple's new products.

Thanks in advance for the help :)