O’Reilly Safari subscription
A Safari subscription gives access to a huge library of technical books and videos. This is invaluable to someone learning a new programming language or trying to write the next big iPhone game. Safari’s monthly subscription cost is less than the price of a single printed programming book. I’ve had access to Safari at a few jobs, and the large selection of searchable books made jumping into a new project much less daunting.
Price: $28/month (Link)