Two interesting ones of late:
First was Richard K. Morgan's second Takeshi Kovacs novel, Broken Angels. This was a pretty light read. Morgan has a pretty good flair for description. You really get a gritty feel for his worlds. There wasn't too much by way of make you sit up and think here, but it was a rip-roaring fun ride. The bulk of the novel has to do with assembling a team to go claim a Martian precursor wreck. There were some interesting views on the Martians and it's interesting to see a different angle on Takeshi.
One thing that concerns me with this one and Altered Carbon, which cause me to deduct a few points is the anti-climax/climax. For some reason, I really liked the body of these books. By the end, though, there's usually some kind of big fight. He completely loses me in these. I space out and start skipping ahead to get back to interesting stuff. Small concern on an otherwise interesting book.
More recently was C.J. Cherry's 40,000 in Gehenna. Late last year I read and really enjoyed The Faded Sun, so i was all set for another really interesting take on alien life. In some ways I was satisfied, in others not. The book spans a little over 200 years in not many more pages than that. It has to do with a group sent to colonize a planet that has a type of lizard-like life form they call calibans already established on it. The first third of the book pretty quickly deals with the departure from Cyteen, the landing, the first generation, the second generation, and the colony spreading out into the world. Then we quickly move on to the bulk of the book, which is the story of some of the descendants and a follow-up scientific mission and how they all interact.
The story overall was interesting, but suffered a little for blitzing through so many generations so quickly and not really having any central characters that were with us through the whole of the book. I thought perhaps picking one of the characters from the last section of the book and telling the earlier parts of the story through research or stories or something might have worked better to tie things together, but all in all, it was another interesting take by Cherryh on a different kind of alien thought.