e.g. I can read English, Latin[,] and Classical Greek.The bracketed comma is an Oxford comma. I have always rather liked the Oxford comma, partially because it can clarify the meaning of a sentence. The Oxford Dictionaries provides this illustrative example:
e.g. These items are available in black and white, red and yellow, and blue and green.According to an article on Salon, the Oxford PR department has decided to drop the Oxford comma (although the "Update" claims that this has been true for several years). As a fan, I am rather sad.
I found while Googling the Oxford comma that a band called Vampire Weekend wrote a song called "Oxford Comma" (which apparently those at Salon found as well). It's a rather random song, but I thought it was an amusing conclusion.