Generating HTML from Lisp is very easy and natural. Of course, there are situations where it might be better to use an HTML template, and there are libraries for that too. Here are a few more examples of HTML generation in Lisp:

A tutorial about writing an HTML-generating DSL in Common Lisp: http://gigamonkeys.com/book/practical-an-html-generation-lib...

The Common Lisp HTML generation library most people actually use[0]: http://weitz.de/cl-who/

HTML generation in PLT Scheme's Continue framework: http://docs.plt-scheme.org/continue/index.html#(part._.Rende...

Arc's built-in HTML generation (powers this site): http://files.arcfn.com/doc/html.html

[0] I'm not actually certain about that, but I think it's the most popular.

clj-html - http://github.com/mmcgrana/clj-html

which is deprecated by

hiccup - http://github.com/weavejester/hiccup

though the latter has pretty lame examples