This has got to be the living end for high-precision, long range shooters, the Tracking Point XS1.
The scope runs on Linux and adjusts the reticle to take into consideration range, tilt, wind, humidity, and altitude density. An iPad app mirrors the scope display so your spotter can see the same thing you do. It requires that you use their own ammo to guarantee repeatability and starts at around $17,000.
I'll wait for the price to come down. For that kind of money I can hire "Big Luigi" Salmonella to go out there and personally stab my intended target to death with his notoriously large stiletto.
H/T to John for the tip.