Let me be cheeky and preempt @pid_eins's systemd 259 posts:

In systemd 259, I'm making it possible to run commands that need privileges as your current user instead of as root. With "run0 --empower", you'll get a session as your current user in which you can do anything that root would be able to do, without actually being root.

This is very useful when you need to run something with privileges but still want all created files and directories to be owned by your current user.

#systemd259