On the one hand, keeping identities anonymous protects reviewers, permits objective reviews, fosters the freedom to provide honest criticism, and protects reviewers from being contacted by authors to comment on criticisms (especially in the case of an unfavorable review). On the other hand, revealing one's identity could potentially foster collegiality, encourage constructive critiques, or perhaps lead to collaborations, etc.
I don't know if either approach is better than the other, though I lean more towards the former.
Any thoughts on this? Has anyone from the RG community chosen to reveal their identity to authors or have reviewer identities revealed to you?