>1. We can only use the LAMP stack. (perhaps with other operating sytems instead of GNU/Linux, but you get the idea). You can use nginx (and lighty as well, I

>1. We can only use the LAMP stack. (perhaps with other operating sytems instead of GNU/Linux, but you get the idea). You can use nginx (and lighty as well, I believe). You can use Postgres (and Drupal 7's ORM abstracts the data model, opening up the possibility of nosql). The only thing you're really stuck with is PHP.