I'd suggest just about anything by Greg Egan, Rudy Rucker, Cory Doctorow, and/or Vernor Vinge. If I had to pick one from each:
Permutation City by Greg Egan
A trippy novel about AI, human consciousness, virtual universes, and a lot more. Egan is an excellent novelist, but also a first rate hacker and his website has some cool Java apps that illustrate some of the concepts from his novels. Several free short stories on his site as well.
Postsingular by Rudy Rucker
Rudy Rucker's books also play around with ideas about computer science, AI, and robotics. This latest novel of his examines ideas of what the world might be like after a technological singularity. Even better, the link above leads you to a page where you can download a free e-book!
Little Brother by Cory Doctorow
Another hacker/blogger (he's one of the founders of BoingBoing.net). Little Brother is a young adult SF novel set not too far in the future. Also available as a free download (actually all of Doctorow's books are available as CC-licensed downloads). Down and Out in the Magic Kingdom is also great.
Rainbows End by Vernor Vinge
Vinge was a computer science professor at UCSD and is an award winning SF writer. Rainbows End is another near future novel related to the concept of the Singularity. Appropriate since Vinge coined the term and wrote the first papers on the concept. It was available as a download, but doesn't seem to be anymore.
None of these are "space opera" type SF, all are related to computer programming and computer science, and all of them are written by people who know a lot about computers, programming, hacking, and cutting edge research and trends.