Place salmon on a large plate and sprinkle over chilli powder, then season with salt. Rub mixture over salmon to coat. Set aside.
Meanwhile, peel back husk on cob then remove and discard silk. Pull up husk to cover cob again. Microwave on high for 4 minutes. Heat a chargrill pan on barbecue grill on medium-high heat and cook corn, turning, for 30 seconds on each side or until charred. Set aside to cool.
Chargrill tortillas for 2 minutes on each side or until charred. Cut kernels of cob in large chunks.
To make the mime mayonnaise, combine all the ingredients in a small bowl. Season with salt and pepper.
Heat oil in large frying pan over medium heat. Cook salmon, skin-side down, for 5 mintues. Turn and cook for a further 5 minutes or untillcooked to your liking.
Assemble burritos using salmon, corn, lime mayonnoaise, tortilas, lettuce, avocado, corrinader , chilli and lime wedges.