Steve Jackson Games release all their hardcover GURPS books as pdfs, with the exception of the two main rulebooks. Until recently there was a delay of three months, they've just changed that as they don't think the PDFs impact the sales of the physical books much. They also release quite a bit of shorter works as PDF-only.
Personally, I prefer to curl up on the couch with a book, but for shorter works PDFs are fine. And once someone invents a dirt cheap and really good ebook reader/tablet pc thing I'm likely to go all digital.
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