actually, that's not entirely true...
a pixel is _not_ the smallest addressable unit for making graphics on a display. with proper hardware control, partial pixels can be used to make much sharper graphics. mostly used on handheld devices, it's not an end all be all, but for certain functions, it's a beautiful thing...
each pixel is actually made of three mini-pixels--one red, one green, and one blue. normally, a pixel is considered as a whole unit, and your eye usually blends everything together, but controlling the rgb levels individually let's you pull some tricks on your eyes.
google for half pixel shading, sub-pixel rendering, antialiasing, graphics tricks on small lcd's, etc. lotta wierd stuff you can do.
anyway...
--cid
http://cidviscous.blogspot.com