Voila, you're installed and ready. You can use sudo apt-get update && sudo apt-get upgrade to update the packages. Ideally, you'll probably want to upgrade to the most recent kernel. This is isn't a complicated process but I haven't tested it yet. Theoretically:
1. Reboot your machine if you have performed any updates.
2. Open a terminal.
3. Use gedit (or vi) to edit /etc/apt/sources.list:
4. Del
5. Save and repeat the procedure for /etc/apt/preferences:
sudo gedit /etc/apt/preferences
6. Delete the contents and replace with:
Package: *
Pin: release a=statler
Pin-Priority: 1001
Package: *
Pin: release a=squeeze-backports
Pin-Priority: 900
Package: *
Pin: release a=squeeze
Pin-Priority: 500
7. Save and return to terminal.
8. You'll notice if you 'apt-get update' now, there will be a problem with signatures. Let's fix this be downloading the appropriate ones now that our repositories have changed.
wget http://packages.crunchbang.org/statler-dev/crunchbang.key
apt-key add crunchbang.key
9. Now we can update and upgrade to the latest and greatest:
sudo apt-get update && sudo apt-get dist-upgrade
Again, haven't tested the second part, but once I do, I'll post any modifications to this process.