From what I can tell, the above coupon code can be applied to most eBooks on the O'Reilly Media website where the publisher is either O'Reilly Media or Microsoft Press, reducing the price of the book to US$4.99. The coupon code does not work with all titles, but I haven't been able to find a pattern as to which titles will work and which won't. Some pretty huge discounts as some eBooks go for $50+
Thanks again - just doubled up and bought some more. Spent $10, got $40+ worth.
When applying the coupon, it displays the message "your ebook upgrade was applied" alongside each book, so this is apparently one of several coupons used with their longstanding offer purportedly intended for owners of their printed books to get a copy on ebook for $4.99. Maybe this particular code is new, but the coupon I used in 2012 (MYEP9) is still functioning.
Brilliant - actually needed one of these and was looking at them this week. For what it's worth, I bought Programming Android 2nd Ed http://shop.oreilly.com/product/0636920023005.do