$ cd /var/www/scott.yang.id.au/htdocs $ svn switch http://svn.automattic.com/wordpress/tags/2.1/ $ curl http://scott.yang.id.au/wp-admin/upgrade.php?step=1 > /dev/null 2>&1
And that's it! Don't let the detailed step-through scare you, it is actually quite simple provided that you use Subversion to manage your WordPress installations and you don't have lots of out-dated plugins.
I just briefly checked the WordPress plugins that I have written, and all of them seem to work fine. Maybe there are more efficient ways to achieve the same thing as WP2.1 has more hooks for developers. Time to investigate on that.
The next release, WordPress 2.2, has also been scheduled to 23rd of April, 3 months from now. But don't be scared, my fellow webmasters and system integrators, by the shortened release cycle. WordPress has also committed to have 2.0 product line alive, i.e. maintained and patched when security threats arise, until 2010. Web 3.0 would be out by then I am sure :)