I've always called it ENWorld like en from envy. Not E - N - World. Most likely because I am lazy and saying the letters adds an extra syllable. Adlon over at mortality.net and mortality radio always makes me feel self conscious because he says it E - N - World.
Well, that's how I pronounce it at any rate. My brother is named "Ian" and when members of my family hear me talking about E-N-World they always think I'm saying Ian World.
Ahh, that makes the ENnies a lot less fun then. When you assume EN = en like envy then it comes out sounding a lot like the Emmys. Oh well, I'm from Texas, no one understands my accent anyway.