Look also at our Frontiers in Mathematics page and the list of seminars and colloquia We also keep a necessarily partial list of events outside the department, both within and outwith the University
Here are direct links to the news services of some of the mathematical societies: "What's New in Mathematics" aimed at the general public and put together by the AMS; for the research mathematician, there is What's New on e-Math and SIAM News
For less heady stuff and aimed primarily at members of the department there are Department Memos (Restricted Access)