Quickstart:
Just copy and rename an existing template.
-The settings panel will see all directory's in this folder ,and let you choose your new template.
-Clicking Ok in the settings panel will restart the webserver and reload your template.

Notes:
Please configure your editor to use 4-space indents instead of tabs.
Or use scite and my config: http://mvoncken.sohosted.com/deluge/SciTEUser.properties.txt

template language: http://webpy.org/templetor

Exposed methods and variables (c&p from deluge_webserver):

template.Template.globals['crop']  = template_crop
template.Template.globals['fspeed']  = common.fspeed
template.Template.globals['fsize']  = common.fsize
template.Template.globals['sorted']  = sorted
template.Template.globals['_']  = _ #gettext/translations
template.Template.globals['deluge_web_version']  = '0.3alfa'
template.Template.globals['render']  = render #for easy resuse of templates
template.Template.globals['sort_head']  = sort_head
template.Template.globals['get_config']  = proxy.get_webui_config

I will update this file if there is interest in making templates.