Spitfire is the perfect unique entrance song for the Flames and it's always worked well for them. Aren't many songs that could do as well.
As for goal songs...
http://www.youtube.com/watch?v=0dHa680mDi4
Well nothing comes even close.
But please, no AC/DC. Their music is not goal song material imo. You need something with a 'dance' kind of beat. Or something with an infectious sing along melody that the crowd can get into and simultaneously annoy the crap out of everyone watching, like the one at the united center.. Something like Zombie nation by Kenkraft, Crescendolls by Daft Punk, The Rockafeller Skank by Fatboy Slim. All would be awesome, feel good songs.. or some other song in the same ballpark.