I have some audible.com things to recommend. There are some wonderful lectures on the celts, Anglo Saxons and history of the English language. If you are an Audible subscriber you can get a 14 lecture series, plus free downloadable course guide for one credit. It is a good deal. I have already listened to the Celtic lecture series and have begun the Anglo Saxon series. The instructors are engaging and the course books have good suggestions for further reading.