This has been posted of a sort before, hopefully its better worded so people understand it. Speccing into http://www.wowhead.com/?spell=51674 will allow you to attack when you dodge. For the people that have enough dodge, it could be a pretty big exploit.
Given the rogue that tanked gruul's, unless he's using ghostly strike, would be pretty neat to see. A possible use for it could be clearing area's for lowbies, or just S&G while getting your exploration achievements.