I just took the Step 1 exam, and did really well. I posted an article on my blog about how I went about it starting from first year. I hope it offers insight to up and comers. Additionally it has the study schedule of a former co-author of the USMLE First Aid. Enjoy
http://streetmd.blogspot.com/2011/08/how-to-prepare-for-usmle-step-1.html
http://streetmd.blogspot.com/2011/08/how-to-prepare-for-usmle-step-1.html