Make sure your friends are well aware of the Terms of Service - particularly around the distribution of copyrighted content.
This is because you as the account holder are held accountable for any domains hosted under your account. Dreamhost isn't going to be assholes about the occasional slip-up, but make sure your friends don't put up something that'll get you banned.
Don't get all worried and paranoid about this, but I wanted to make sure you reminded them of that.
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