The well known German  orc player mTw-Tak3r has recently published a very nice tower rush guide. In his guide Taker describes some basic need-to-know facts about tower rush and talks about offensive and defensive towering. Christopher 'Tak3r' Heil is the very founder of towering so this guide is definitely a must-read for all orc players.

Here is a little excerpt from the guide:

Good towering has the need to be always one step ahead off your enemy. Hidden towering should be invisible for the opponent and aggressive towering should be explosive, surprising so that the other guy isn't able to react or counter your towers. A good tower player practices his strategies also offline or using smurf accounts. The tactics have to be in you, everything should be timed exactly and you should be able to check the enemy's range within few seconds in order to position your towers well and be able to fight against Creeps in the meantime.

  mTw-Tak3r