Using some good code every day? It is not shipped with stock CouchCMS? Let the community know about it!
Every day I happily use following things:
HTML <base> tag, really makes redundant adding <cms:show k_site_link /> to all links.
<cms:rel /> tag which outputs markup for CSS and JS files, as well as (!) helps automatically download most recent version.
<cms:date return='+ 1 day' /> which helps with filtering pages by dates - for example showing today and tomorrow very easily.
And of course, I write a lot of comments, so function stripping comments from output really saves me.