Gentoo:

101       4079  0.0  0.2   2716  1352 ?        Ss   08:20   0:05 /usr/bin/dbus-daemon --system
eva       5245  0.0  0.0   2636   256 ?        S    08:25   0:00 /usr/bin/dbus-launch --sh-syntax --exit-with-session
eva       5246  0.0  0.1   2316   712 ?        Ss   08:25   0:03 /usr/bin/dbus-daemon --fork --print-pid 4 --print-address 8 --session
101      11510  0.0  0.2   2184  1088 ?        S    23:13   0:00  \_ dbus-daemon --session --print-address --nofork
101      11516  0.0  0.2   2188  1076 ?        S    23:13   0:00  \_ dbus-daemon --session --print-address --nofork


Ubuntu:

101       4517  0.0  0.2   2976  1236 ?        Ss   Jul03   0:12 /usr/bin/dbus-daemon --system
root      4654  0.0  0.2   2720  1052 ?        S    Jul03   0:00  \_ dbus-daemon --session --print-address --nofork
aurore    5360  0.0  0.0   4252   244 ?        Ss   Jul03   0:00          \_ /usr/bin/ssh-agent /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session /usr/bin/seahorse-agent --execute /usr/bin/gnome-session
aurore    5361  0.0  0.0   4248   392 ?        Ss   Jul03   0:00          \_ /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session /usr/bin/seahorse-agent --execute /usr/bin/gnome-session
aurore    5364  0.0  0.0   2664   412 ?        S    Jul03   0:00 /usr/bin/dbus-launch --exit-with-session /usr/bin/seahorse-agent --execute /usr/bin/gnome-session
aurore    5365  0.0  0.1   2852   932 ?        Ss   Jul03   0:01 /usr/bin/dbus-daemon --fork --print-pid 4 --print-address 8 --session