I enabled the experimental repositories and installed upstart (which removed sysvinit). I knew it just went way to easily! I was right, my system will not boot. Is there any way to fix it? I don't know where to start. Thanks!

I was able to fix it and reinstall sysvinit via chroot. But is there a way to get upstart working in Debian?

Well, now you know why
a) it's called UNstable in the first place
b) the Debian-dev's strongly discourage any users to use Sid, unless someone really knows what he's doing and
c) you shouldn't disregard such strong warnings, even if others claim to have succeeded (results achieved by others doesn't necessarily mean you reach the same results as well... ;-))

Anyway, there are 2 ways to fix this and neither is easy, quick or trivial.
1) get the Etch net-install cd and start from scratch, making sure you only upgrade to Testing if you really cannot live without the latest and greatest. Backup your data before you start.
2) build a bootable CD to create a rudimentary Debian system so you can remove the Experimental stuff and re-install sysvinit. Again: backup your data before you start. (hint: you can override the settings in the Grub menu by adding the root= parameter on the Grub commandline, pointing it to the root filesystem on the cd)

upstart is in experimental for a reason, when it is more or less ready it will make its way into Sid.

Congrats on getting things fixed. Thats one of the reason why I keep a nice livecd like sidux on hand for just those fun times when things go crazy.

No reason not to experiment and learn. It is always wise, however, to keep at least one, preferably several, different alternatives available so that if something breaks, you have system(s) that work while you figure out what happened and how to fix it. This is a great way to learn without having to press the panic button.

Asking questions is OK, but the more you can research first before asking a question, the more you learn, the more focused your questions become, and the more likely experts are to answer your questions - because they see your effort and appreciate the scenario you have encountered because you describe it in detail.

These are principles I try to apply when I am testing something. If I just don't have a lot of time to research, sometimes I will still ask questions, prefacing them with the fact that my research time is limited. I still try to figure out as much as possible and provide the background necessary to get the question intelligently answered. Most of the time I get an answer, but sometimes I figure it out first. In that case, I share back that I have found an answer, document it and let others know so that: 1) They don't have to answer and 2) That others may benefit from what I have learned.

I feel these are good practices.

You can restore your system but you need to make live cd/usb with Debian or Ubuntu system.
Make following steps:
1) boot for live cd
2) open terminal and login as root (You need root privilegies). Accomplish command: `sudo -s`
3) Mount your root of your linux system. For instance: `mount -t ext3 /dev/sda1 /mnt`
3) change root to just mounted root by `chroot /mnt`
4) to remove upstart run in the terminal `apt-get remove upstart`
5) to install sysvinit go to `cd /var/cache/apt/archives/`
6) type and run following script:

for pkg in sysvinit*.deb
do
dpkg -i "$pkg"
done
7) Reboot to your system

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