Wordpress
Installation
apt-get install wordpress
Setup apache to point to /usr/share/wordpress.
See the /usr/share/doc/wordpress/examples/apache.conf
Database setup can be done with the help of a script in /usr/share/doc/wordpress/examples/setup-mysql
bash /usr/share/doc/wordpress/examples/setup-mysql -n wordpress <my.blog.site>
It's a bit more tricky if your mysql server is not localhost, you can make a copy of the script and make some adjustments and/or create the DB and user manually
To get nicer URLs (e.g. <my.blog>/2008/04/mypost), add this to /etc/wordpress/htaccess:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
To add Piwik to Wordpress, see here
Plugins
Piwik
OpenID
install this plugin
Client
ScribeFire is a very nice plugin for Firefox to write blogs easily