WordPress 2.2 has been released with tons of new features and security bug fixes. From the official announcement blog post:
On behalf of the entire WordPress team, I’m proud and excited to announce the immediate availability of version 2.2 “Getz” for download. This version includes a number of new features, most notably Widgets integration, and over two hundred bug fixes. It’s named in honor of tenor saxophonist Stan Getz.
=> WordPress Widgets allow you to easily rearrange and customize areas of your weblog (usually sidebars) with drag-and-drop simplicity. This functionality was originally available as a plugin Widgets are now included by default in the core code, significantly cleaned up, and enabled for the default themes.
=> Full Atom support, including updating our Atom feeds to use the 1.0 standard spec and including an implementation of the Atom Publishing API to complement our XML-RPC interface.
=> A new Blogger importer that is able to handle the latest version of Google’s Blogger product and seamlessly import posts and comments without any user interaction beyond entering your login.
=> Infinite comment stream, meaning that on your Edit Comments page when you delete or spam a comment using the AJAX links under each comment it will bring in another comment in the background so you always have 20 items on the page. (I know it sounds geeky, but try it!)
=> Protect you from activating a plugin or editing a file that will break your blog.
=> Core plugin and filter speed optimizations should make everything feel a bit more snappy and lighter on your server.
=> WYSIWYG support in a future version of Safari.
I've upgrade this blog to 2.2 w/o a problem. However I need to upgrade my comments.php and other stylesheets to take advantage of new features.
WordPress 2.2 Download Link
=> Please visit this page
On a related note you may find our UNIX wordpress command line upgrade notes useful.