The iPod’s white earbuds would be easier to use if one of the earbuds was colored.
The only way to determine which piece is for Right Ear versus Left Ear is to hold one of the pieces close to the eye, turning the piece to view the single letter (“L” or “R”) faintly marked on its inner-side.
Ironically, Apple celebrates its releasing of various colors for various products, but the lack of an additional color Within an existing item makes it less usable.
You almost get the feeling that the geniuses would ‘rectify’ this problem, by releasing an all-green ear buds….amen.

What you can do: use a marker to color one of the buds. Or, use high-quality stereo headphones.
In that case, the Left and Right sides is known / derived from the shape of the phones.
Even if still ambiguous, at least the quality sound makes up for the momentary confusion. Not something that can be said of the shabby iPod phones.
(My editor just informed me that any mention of iPod phones must include the word “ubiquitous.” )

The iPod earbuds are ubiquitous but far from perfect.