Why is there no source archive to download yet?
This is because the source code is not yet easy to use. Some settings and the printing templates are still hardcoded. You need to adjust the source code to change some settings and the printing templates. If someone wants to fix this issue, she or he is welcome to do so. Until then it is more easy for you to sync the source with the Subversion tree so your customizations are not overwritten and you can easy port them from version to version. Also, downloading by Subversion ensures you are smart enough to do such customizations to the source code. 