Group reviewing a manuscript sent our for review. Ethical? Is it ethical to "group review" a un-published manuscript sent out for review? 

For example, you received a manuscript for review and you shared it with your lab group or group of colleagues, with the permission of the journal but not the permission of the authors. Is this ok?
Grey area, leaning towards unethical. Confidentiality is an important value in the peer review process, and the usual understanding of confidentiality is that the paper will be distributed to the minimum number of people required to perform the reviews. Therefore, your case, where a group of people replaces a single person, can be seen as a violation of confidentiality.