[wp-hackers] Wordpress Event Viewer Plugin

[Michael Dale]

A word of warning, please realize that some users will be highly offended if
  they find out failed passwords are logged in plain text anywhere in the
  system.  You would be logging failed attempts by valid users as well as fake
  ones.The event viewer doesn't log passwords. The events look like the following:

2007-04-04 00:05:56  WARNING  Login Failed: Unknown User, bla
2007-04-04 00:05:59  WARNING  Login Failed: Incorrect Password For, admin