Actually mildly annoyed, since I got in on the pragprog 40% off deal for black friday, and now many of their titles are available here for 60% off today.
On the topic of eBooks, why on earth is the iBooks Store so useless? The selection seems to be tiny and the only way to browse is through very broad categories like 'non-fiction.' it's like Apple out it up there just for show and don't seriously care about it.
FYI, Microsoft Press ebooks, which are also sold through O'Reilly, qualify for this deal too. For whatever reason, they are not listed on the parent link though.
Oh - in that case, Charles Petzold's 'Code' is in my opinion a genuine masterpiece. It's a hard-to-place book in many ways. It explains what computers 'are' from the ground up, in a way that's accurate, fun to read if you're even passingly interested, and fairly complete.
A fascinating book for both those who know nothing about computers, and so well written it's still a great read for those who know them inside out. If not for yourself, it's possibly a great gift for a family member who wonders what exactly it is that you 'do'.
Oh why don't they have the latest edition of JS The Definitive Guide on sale?? Beware: don't buy the old edition which is on sale (it's four years old). The 6th edition is available for $25 for both online access and pdf version, so I just bought that - http://my.safaribooksonline.com/9781449393854.
What's the source of this code? Using an unsourced coupon code is is in the least ethically troubling - how do I know it wasn't intended to be private?
More practically, how do I know I'm /allowed/ to use it, and O'Reilly won't be within their rights to bill me the full amount later when they work out what's going on?
Once you've bought something, and assuming you don't opt out, O'Reilly email details of these offers to you - that's possibly where the OP heard about it. They seem always to be generally available via the home page.