An exciting possibility is for applications which serve dynamic pages via haxe->mod_neko with compiled tenjin templates. This would seem like a very fast way to generate dynamic pages from json data sources. The json could quite easily be generated in any language - including python, static files, or any webservice through mod_proxy.
It all depends on the project of course. But I'm definitely considering genshi (with genshi2js), and tenjin for future projects.