Just finished "Thrice Upon a Time" by James P. Hogan, originally bought from Baen in November 2000. Excellent Hard SF with the theme of communication through time, and the paradoxes inherent in that.
Baen description:
Quote:
It's amazing enough when Murdoch Ross's brilliant grandfather invents a machine that can send messages to itself in the past or the future. But when signals begin to arrive without being sent, Murdoch realizes that every action he takes changes the future that would have been . . . and that the world he lives in has already been altered!
Then a new message arrives from the future: The world is doomed!
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Very, very highly recommended, but be warned that is it quite "technical" in parts.