“In Hartford, Hereford, and Hampshire, hurricanes hardly ever happen.” – Why did poor Eliza Doolittle struggle so much with this simple sentence? This episode deals with just one letter: An “H” can be quite a hassle, as you will learn.
Wikipedia on H
Quite a long article for something as simple as a letter of the alphabet.
Social Variation in English
An interesting article with listening examples, one of them illustrating the phenomenon \"h-dropping\".
Podcast on American Pronunciation of the H
This podcast about American English pronunciation focuses on our letter of the day in its 28th episode, too.