Sensory overload is a relatively unexplored area in Human-Computer Interface. In most case, you want to avoid it because user interface that overload the senses will confuse more than inform the user. In some specialized cases, you want to overload the senses to promote intuition over logic in presence of an information avalanche.
For example, a stock trader has to monitor hundreds if not thousands of information sources in realtime to make informed decisions. But today's trader tools use primarily visual means to deliver information and human eye has relatively poor bandwidth when compared to other sensors.
A possible solution I came up with (ten years ago?) was to use the whole body to deliver information. This means a chair with full force-feedback capability, using gyros and hydrallics, powerful embedded speakers, and joysticks for delivering fine-grained force-feedback to hands and to receive inputs. Hooking up the chair to NASDAQ will mean the user will feel and hear every bumps and twists the market makes on top of visual data piped through a surround video.
My theory is that such a device will cause a sensory overload which will induce either a mental breakdown or a trance in which sum of all the information emerge as intuitions and subconscious reactions. Even if one learns to use the chair successfully, one can last only so long because one year on the chair will be equivalent to a year of combat flying.