That is very easy and fast for WordPress 2.7 upgarde. Just upload the latest code, then done. Moreover, that has not the Chinese Characters encoding problems in 2.6.X.

http://wordpress.org/development/2008/12/coltrane/
WordPress 2.7 is released. That is a completely new interface!

I installed the WordPress Mobile Plug-in, http://wordpressmobile.mobi/. That is very easy to use. I upload the file into the plug-in directory. And it will be auto detect your browser version. If that is a mobile version, then it will display the simplified version. But you need to customize the advertisements, $backlink and $admobbottom.

http://wordpress.org/development/2008/12/wordpress-27-release-candidate-1/

WordPress 2.7 RC1 is ready to download now!

I have installed Captcha Image on b2evolution. But I got an error about "No TrueType Font". That is easy! All you need to do,uploading a TrueType to "/fonts" under the plugin. That will works