Stephen Fry — British comedian, quiz show host, and public intellectual — has just started a new series of his BBC Radio 4 program on the English language, "Fry's English Delight." In "So Wrong It's Right," Fry "examines how 'wrong' English can become right English." Our old friend the eggcorn makes an appearance about 11 minutes in. Jeremy Butterfield, author of A Damp Squid: The English Language Laid Bare, explains eggcorns to Fry (damp squid is an eggcornization of damp squib, in case you didn't know). Butterfield also talks about spelling changes, like the back-formation of pea(s) from pease, and how lexicographers use corpora to track changes in language (with specific reference to the Oxford English Corpus, the main subject of A Damp Squid).
You can hear the whole thing online, at least for the next week.
And for more of Fry's linguistic musings, see my post, "Fry on the pleasure of language."
(Hat tip, Damien Hall.)