Quick Note: WordPress 2.6.1 is out.Â If you are running an older version, especially if you haven’t even
gone to 2.6.0 yet, you should upgrade – you’re missing out on new functionality and you may be at risk of having your site taken over.
Things to remember when upgrading: deactivate your plugins first, not all plugins work with all versions and you may need to find alternates.Â Check that your themes will support the latest versions and that any custom code you may have inserted (you did comment the code, didn’t you?) won’t produce conflicts.
Finally, read the documentation for upgrading.Â If you are new to WordPress.org and need to know how to install it, there is documentation for that, too.Â If you get stuck, the WordPress.org forums are a source of knowledge and help – search first and then ask your question in the right sub-forum.