HHVM is awesome! Fortunately there are a lot of awesome projects in the PHP world lately, HHVM is definitely one of them! The team's choice to go the FastCGI way makes it easy enough to switch to Nginx+HHVM from an Nginx+PHP-FPM setup (for example). One thing I'd really like to see in the future, although I'm almost sure it won't happen (at least not in the foreseeable future): to run child processes with a different user and group, it would be great for security on shared environments. And thanks for mentioning my blog post / tutorial, Sarah! :)