If you run your own Wordpress blog, you should pay attention to keep it updated. You can download the latest version of it here but the dashboard inside the administration panel always shows whether you're running the latest version or not. 

With newer versions of Wordpress, a link will flash in the footer of the administration pane, urging you to upgrade. If you are up to date nothing special will appear in the footer.  Upgrading a Wordpress blog is a rather straight forward process and can be done using various methods.

The first thing, as with everything should be a backup of your blog. The backup must include the database and the physical files within your home directory. This is needed in case something unforeseen should happen during the upgrade and you need to revert your steps. Most hosting solutions include a database management tool called "phpmyadmin" which can be used to export your current blog database. 

Once the backup has been completed, simply follow these steps. 

1. Overwrite all *.php files in your blog root with the new files from the Wordpress download. Depending on whether you have shell access to your site, this can either be done with command line access, or via ftp. If you do this via ftp, simply upload all the *.php files with your favorite ftp client. When prompted to overwrite existing files, chose yes to all.
   
2. Overwrite the 'wp-admin' and 'wp-includes' folder with the ones from the fresh download.
   
3. Go to this URL: http://yourdomain.com/wp-admin/upgrade.php
4. Follow the Instructions
5. Once the above process has been completely, login to your blog and verify everything is working properly.