WordPress 2.9 is out, and my inbox is really full, with questions whether WordPress Automatic Upgrade still works, and whether it will allow you to upgrade to WordPress 2.9. As I have answered this question in the past, WPAU hardly relies much on the underlying code in WordPress and mostly works on its own.
So the answer to whether WPAU will work to upgrade WordPress 2.9 is a big YES. I personally upgraded few of my blogs using WPAU, since I prefer it to the inbuilt upgrade.
If you have been using WPAU, you can rest be assured that it will continue working for any future updates in WordPress. I promise to update it, if and when it stops working with any new versions of WordPress.
If you are looking to upgrade the manual way, visit the WordPress Codex entry and follow the instructions to upgrade your blog to WordPress 2.9. Please remember, no matter which option you choose to upgrade to WordPress 2.9, always make sure to make backups of your database and theme files, WITHOUT FAIL.
Asides, I have been monitoring the WordPress forums for any problems with an update to WordPress 2.9 and haven’t seen any major one’s right now. One issue I did see was that you will require to have at-least MySQL 4.1.2. My advice would be to use a web host who supports both PHP 5 and a higher version of MySQL.
Have you upgraded to WordPress 2.9? Did you come across any issues with it? Do let me know through your comments.