Perfectly good WP 2.7.1 blog that I upgraded to WP 2.8 (automatic install). The front-end works, but the I can't do anything Ajaxy in the admin (upload media from post, add tags, etc.). Looking further and it seems like none of the JS libraries are loading.
Going to do a fresh install and make sure nothing happened during the automatic install. However, if that is still broken, I think I have a solution to the problem.
Will know more shortly.