Is there an equivalent of svn\'s blame for Perforce on the command line? p4 annotate doesn\'t display usernames -- only changeset numbers (without ancestor history!
p4 annotate
From the p4v client, you can get "Time-lapse View" context menu on all the view displaying file like Files, Changelist etc.
The time lapse view has quite a few options like Single Revision, Multiple Revision to analyze what was changed, when and by whom.