Interesting thread, the stopping of the game for reviewing footage is a real issue and probably why the technology isn't introduced.
There's always the option of going over the top with some Skyesque Super-Soccer razzmatazz, such as rope-lights embedded in the goal frame, or jets of steam and metallic ticker tape blowing out the top of the posts, with some shite music to go with it. Gooooaaaaal, in association with Shitehawk.inc
Different thing but yesterday I was at an Under 9's game and a shot crashed down off the bar and then back into the keeper's hands. Nobody at the game thought it was a goal, even the striker's coach put his hands behind his head and shouted "Unlucky...etc" then the ref gave it as a goal anyway. Bit odd.