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As of now I am in at GTown, however, NYU and Columbia could very easily get back to me with an offer after I apply to firms. This would be great but how should I reflect this issue on my resume? Better to do in a cover letter? Should I wait to apply to firms after I know with 100% certainty where I will be in Fall 2011?

You will know your transfer decisions by mid to late July most likely, and you shouldn't be independently applying to firms before then anyway