If you ever want to change your permalink structure in WordPress, but still want to have all your old URLs to work, download Permalink Redirect Plugin. This plugin will make sure that all your posts will get redirected to the new permalink structure you moved to without any hassle whatsoever. Not only will your readers be thankful, your SEO rank will not suffer with any URL reorganization.

WordPress 2.0.10 and 2.1.3 have officially been released. The new versions of WordPress has several security fixes for publicly known issues. Please update your WordPress installations immediately.
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WordPress 2.1.2 has officially been released and contains a few security fixes. If you are using WordPress 2.1.1, it is extremely important you update immediately.
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WordPress 2.0.9 and 2.1.1 have officially been released. The new versions of WordPress has several bug and security fixes.
Download the latest versions of WordPress: WordPress 2.0.9 and WordPress 2.1.1

WordPress 2.1 has officially been released. The new version of WordPress has over 550 bug fixes and several new features.