Remember when I wrote WordPress 2.7 has arrived? Well, now WordPress 2.8 has arrived. And, since the advent of 2.7 it is now easier than ever to upgrade your WordPress installation. Now you can automatically update your entire WordPress installation straight from your WordPress admin panel. This new feature is called Core Update. Please check the core update host compatibility list before proceeding.
Another quick down and dirty way to upgrade WordPress is to use the automatic WordPress plugin from Techie Buzz. This fine plugin will have you upgraded and up and running in a matter of moments.
Last, but certainly not least is the way I did it before WordPress 2.7. I manually uploaded my files to my web server using FTP. This gave me full control of the files but is the most time consuming of the methods though it is considered by some the most reliable way of upgrading WordPress.
Though I upgraded manually a few different ways this is the most efficient way of going about it. As long as you are at the latest version come update time. Why not use a file comparison utility? A file comparison utility will help you compare and merge the differences between versions of files. Updating only your changed files will get you to the newest version of WordPress quickly and maybe when it is time for the next update you will be less apt to put if off.
Again, there are many ways to upgrade WordPress manually choose whichever method works best for you.

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