There is no way to gain admission to a program for August 2008 at this point. The physics GRE test dates have already passed. The next opportunity you will have will be to take this test when it is offered in April of 2008. I don't know which schools offer admisison for the term starting in December of 2008, but the vast majority of schools do not accept students for this term. If they do, it is highly selective.
You would probably be better off doing research for a year. Take your subject GRE in April or October of next year, take your general GREs, and do well on your TOEFL, and apply for the term beginning in August 2009. Applications for this term are due December 2008 or January 2009.