Since it has already helped me a lot on setting up my personal website (http://www.shaneduan.com), I have decided to burn some midnight oil to release 0.7.0.
Now the whole BuildMaster site can be downloaded from here http://rubyforge.org/frs/download.php/11919/buildmaster-0.7.0-docs.zip. Source is also included so that it can serve as an example itself.
Still need to work on a better way to convert absolute path reference (for link, css and images references). And need to support a site descriptor like Maven or XSite so that the XHTML writing for the skin won't be so intimidating.