Ask HN: In-memory Webserver

I've been thinking about my needs for a webserver and seeing as how I'm only going to be serving static pages I want to concentrate on speed and simplicity. In my scenario I'll have a set of pages that aren't going to change, and if they do, taking down the server would be okay. My question is then:

Is there a webserver that, when started, reads all pages into memory and then never touches the disk again? Would a similar effect be better achieved with something like Apache + memcached? Other suggestions?