Try as I might, I just can't figure out whether any of Ian McDonald's books are available in e-editions. I do think his work would qualify as "hard" SF, but the atmosphere gets so dreamy, it does read more like fantasy sometimes.
Looking it up, I see they'll be re-issuing my favorite, Desolation Road, at the end of July 2009 in paper, for what it's worth.
Also, HardSF-wise, I'd recommend just about anything by Bruce Sterling (e.g., A Good Old-Fashioned Future), including The Difference Engine, which is probably disqualified on technical grounds.
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