I remember seeing a few folks complaining about the really long message of money looting now that we have the guild perk for depositing 5% to the bank, so I came across this addon for those of you looking for a way to get rid of it.
http://wowinterface.com/downloads/info19056-StupidCashFlow.html (http://wowinterface.com/downloads/info19056-StupidCashFlow.html)
Another way is to just create a new chat window on your chat tabs and make all the loot messages go there so that they dont clutter your chat box.