Courses for summer 2008 at the University of California, San Diego, are now in full swing. There is a roster of 28 courses posted at the UCSD podcast website. Most of the offerings are in math and science, but there are several political science and economics courses. UCSD does not leave its courses online after the quarter ends, so if you see something of interest, be sure to download it before the end of the summer session.
It is very good that you mention UCSD removes the podcast at the end of the session. I have seen courses being removed so quick that the downloading frame for the last lecture was less than a week