This is nearly a month old; I'm not sure how I missed it. Lisa Spangenberg, the Digital Medievalist, has a nice meditation on fairies as "other" in medieval literature, specifically focusing on Sir Gawain and the Green Knight and Sir Orfeo.
For those who don't follow lit-crit, "other" is a specific literary term that Spangenberg unpacks in the essay. Postcolonial theory tends to use the term "subaltern" to describe a similar idea. Even if aren't interesting in the lit-crit side of it, who doesn't like fairies?