Online game cheaters!

News: 

A very interesting thread over at Slashdot concerning online game cheating through exploits and hacks. .. the original zdnet article is over here.

"Game publishers and analysts expect the segment to grow significantly in the next few years--to as much as $1.8 billion in 2005 by some estimates."

To get the discussion board going (because I know there are PLENTY of you people visiting :)), I've made a thread here about Online game cheating.. what do you think can be done to prevent online game cheating? What avenues have already been taken that didn't work, and why? (please don't mention the inbuilt wall hack in Counterstrike v1.4 ;)) And what has peeved you off in your most recent online game experience, regarding cheaters? :) Please join the discussion here!