It's quite ironic in a way. The 1966 world cup that England won (against Germany), one of the goals that WAS allowed (came off the cross bar and then bounced down) and I'm pretty sure its been confirmed (using "Goal directed metrology") to NOT have crossed the line.
http://en.wikipedia.org/wiki/1966_FIFA_World_Cup_Final#Controversial_third_England_goal_in_extra_time
Two games today and two more reasons - not for "goal-line technology" but - (IMO) for a wimbledon-style ability of a team to dispute a linesman or ref's decision (only say two or three times during each half) and have it unquestioningly confirmed with video analysis - be it a ball crossing the line (or not) or a goal created via an offside pass.
EDIT: More evidence supporting the need for "goal-line technology" - referees with histories of bad decisions:
http://uk.eurosport.yahoo.com/27062010/58/world-cup-2010-england-blunder-ref-banned.html