So I never read it personally, but I recall hearing about a story set in the future in which it's discovered that as observation collapses quantum states, it's possible to - through cybernetic brain alterations - actively choose which way you want it to collapse, generally to make matters of odds turn out slightly in your favour/slight reality-altering powers.
As it turns out, humans' observational powers are unique, and other races in the galaxy are being gravely endangered as humanity makes observations regarding the rest of the universe that conflict with what they necessarily need to survive/exist. To remedy the situation, the aliens are apparently erecting a massive opaque sphere around the solar system.
I believe the plot proper has to do with someone trying to investigate the rise of some kind of virus capable of hijacking a person's will and directly controlling their observational powers, with the intent of using the collective observational power of millions to massively warp reality - I think just for anarchic reasons.
That's about all I can think of at the moment, I'd really appreciate it if anyone's heard of this.
And I am 99.999% certain this is not The Quantum Thief...