Once a week the American Institute of Physics sums up the latest advances in physics, from cosmology to nanotubes. Browse past issues, search for particular topics, and sign up to receive the news via email. Frozen - use arXiv for new submissions. A large archive with plans to digitize Phys Rev from 1893.
Summaries are approximately one page long and are issued two or more times every week.
FYI subscriptions are free. The content of the Google directory is based on the Open Directory and is enhanced using Google's own technology.