On our sequence systems there's a significant increase on logging used throughout the system and it's saved my butt quite a few times. The more logging the better. Having read 

 http://highscalability.com/log-everything-all-time

I am now planning on reviewing the OJBase logging stuff which makes it trivial to do logging both to text files (the infamous oj.log) and to an event table on a database. Need to handle log rotation, separation and maybe look at increasing the efficiency rather than hammering the hard disk all the time.