Don't forget that TACACS can log all commands entered into a router. When used in combination with rancid and cvs/cvs-web, it's very useful.
> I'm looking for a simple tool, in which each and every one has to > manually record whatever (s)he has done or any incident (s)he observed > so that the tool archives that data someway. Later, in case if someone > needs, (s)he should be able to search for that archive by date, by > person, by a random phrase, etc. rancid (http://www.shrubbery.net/rancid) and cvs-web (http://stud.fh-heilbronn.de/~zeller/cgi/cvsweb.cgi/)