When you have a working SBS 2008 server, and don't know the password to get into Directory Services Restore Mode, you might want to reset it to something you do know.
You will need this when for instance, the AD gets screwed up, or, in case of SBS, you get locked out (even though you're an Administrator).

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Resetting domain password on a SBS 2008

With the installation of the SBS, the DSRM password will be the same as the password you enter for the Administrator account. So, if the password hasn't changed, or you still remember it, try that one first.

You can change the DSRM password by using ntdsutil.

Open up a command prompt, and start ntdsut  ...