My study permit expired in May, 2011. I overstayed and left august 30th, 2011 from canada. I had a usa visa, so i re-applied from new york with my registration letter, proof of tuition, bank statements, transcripts and other documents as requested by the embassy, I sent in my application on the 8th of september and got my permit, 7days after. Leaving for canada soon, I am glad the issue was resolved because i did not want to stay illegally in canada, I was scared of leaving because i thought i would be refused because i overstayed but i am happy i re-applied for the permit.