Hi Morten,
You can either use the Additional Attributes in the list computer component (the attribute you want is DistinguishedName), or - oddly enough, you can use the Get User component, and just feed in the Computer name. The Get User component actually will get any LDAP object in AD. As long as the computer exists, you'll get back the right data.
As a last alternative, you could create you own LDAP integrtion component that will get back the data you need.
Rob