The recent stage 3 archives (May 2011) are the first the include our new init
system OpenRC.
There are some quirks still that need some manual work to resolve.

UPDATE (July 4): This issue has been fixed in at least these stage archives:
	* amd64 (20110630)

NOTICE: Some places suggest enabling CONFIG_DEVTMPFS in your kernel.
This is a workaround which will make your system boot, but is not a proper
fix.

The most typical symptom you might experience is that the system does not boot
after you have completed the installation. To fix this, you have to execute
the following steps.
If you read this during your installation, you can fix this while still on the
LiveCD, if not, please reboot your machine into the LiveCD environment, just
like you did while installing.

The following instructions assume that you have mounted your complete Gentoo
filesystem in /mnt/gentoo/ EXCEPT for the bind-mount of /dev.

First, some device node files need fixing: From within the LiveCD (not
chrooted), execute:
# cd /mnt/gentoo/dev
# rm null
# mknod --mode=600 console c 5 1
# mknod --mode=666 null c 1 3
# mknod --mode=666 zero c 1 5

Now, chroot into your installation (chroot /mnt/gentoo /bin/bash) and execute:
# rc-update add udev sysinit

By doing these steps, you allow udev to correctly start and populate /dev for
you.

Additionally, you might have to create the init scripts for your network
devices:
# cd /mnt/gentoo/etc/init.d
# ln -s net.lo net.ethX
execute this step for each of your network interface cards, replacing X with
the device number.