Tough question, because most of the ones I'm fond of, I read over a decade ago, and I'm not sure I'll still like them now. Some favorites that I've read or reread in recent years:
- A Fire Upon the Deep by Vernor Vinge
- All Systems Red by Martha Wells
- Blindsight by Peter Watts
- Children of Time by Adrian Tchaikovsky
- Glasshouse by Charles Stross
- Lady of Mazes by Karl Schroeder