After the uproar about Wizards of the Coast pulling all their PDFs and cackling around the boardroom, the rest of the industry has responded by having a sale and pledging they will not do the same.
Probably the best statement came from industry giant, White Wolf, who promised to keep their PDFs online and also have a massive sale, including giving Exalted 2nd edition away for free. Needless to say my copy is downloading as we speak.
Other companies such as One Bad Egg, Green Ronin and Paizo are selling their PDFs at discount prices, taking advantage of a cyber world without WotC.
For more offers go to Mad Brew Labs.