The most notable distribution using systemd is Fedora. Though it is used by many others. Additionally, with Debian having chosen to go with systemd over upstart, it will become the defacto upstart system for most distributions (ubuntu has already announced they will be dropping upstart for systemd).
systemctl
-- list all known servicessystemd-analyze blame
-- time spent by each task during the boot processsystemd-analyze critical-chain
-- list of the critical chain of tasks during the boot processsystemctl list-dependencies
-- the list of the dependenciessystemctl list-dependencies sshd.service
-- list sshd dependenciessystemctl list-dependencies graphical.target | grep target
-- dependencies for a particular target
systemctl daemon-reload
-- reload the configuration