Hearing:
A nice clear overview and An animation
Smell:
a little overview and here's another overview and as we all know, some things just go together so check out this smell and taste combined video.
Taste:
A 6 minute mini-documentary, click on "view"
This might drive you out of your mind, but if you have fast processing speed check it out
Really nice, easy to understand overview of taste
The vestibular sense:
The Gate control theory of pain:
Before you do anything else, read this short paper
a longish (7 minute) interview, that will help clarify
and finally, a nutty little animation
