Just a little more than a week ago we had a mandatory security update for WordPress 3.0 and here we are with another update to WordPress that bumps it to version 3.0.3.
This is also a security update as well:
This release fixes issues in the remote publishing interface, which under certain circumstances allowed Author- and Contributor-level users to improperly edit, publish, or delete posts.
These issues only affect sites that have remote publishing enabled.
Remote publishing is disabled by default, but you may have enabled it to use a remote publishing client such as one of the WordPress mobile apps. You can check these settings on the “Settings → Writing” screen.
This update only has to change four files so it is very quick and painless. I have already done the updates my sites.