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Suppose you get an exception notification and you want to know which user was browsing the site when the exception occured. The exception email has the HTTP_COOKIE header with the _session_id. Assuming you are using ActiveRecordStore and that you store the user ID in the session, you can look it up with an incantation like the following:

CGI::Session::ActiveRecordStore::Session.find_by_session_id('c5934a07b12ae9d90cf6be4e7d48b361').data

I keep forgetting the module path to the Session class so I thought I'd post this note. The corresponding Rails file is active_record_store.rb in ActionPack.