Week 4, Blog 1

Psalm 92 says in the second verse that it is "good to acclaim the Lord." Many of the psalms of praise urge the reader to shout,sing, etc. to God (e.g. Psalms 66, 96, 98). Worshiping God and giving him glory seem to be expected of the people who read the psalms. This expectation could be considered an ethical guideline.
In general, the psalms do not give specific ethical guidelines. Some do seem to refer to rewards and punishments for obeying or not obeying some sort of moral code. What this moral code actually is, however, is not really specified in the psalms. The guideline of giving glory to God isn't terribly hard to follow, provided one believes in his existence. However, the hints of God condemning those who do not obey him, whether here or in the afterlife (e.g. Psalms 2, 5, 28) might be rather hard for people to accept.
Other parts of the ancient Hebrew texts include many very detailed laws. These are not described in the Psalms but the original readers of them would most likely have been familiar with them. They would have taken the threats of condemnation to be in terms of breaking these laws.
The commands to be worshipful of and thankful to God seem to be part of what we consider to be Christian ethics. However, most ethical commands relating to killing, stealing, etc. are relatively absent from the psalms.