There are quite a number of small HTTP servers. However, I wouldn't use them. First off, they're more likely, methinks, to be buggy. Secondly, your customers are likely to use Apache -- if your demo runs on the same platform as their server, then that's just another plus. Thirdly, you already need to know how to admin apache; no reason to have to learn another one for no good reason. Fourthly, apache is mature; it's likely that it's been ported to whatever system you want to build a CD for -- win32, linux, mac, random unix of the hour...

That said, the only tiny web server I've delt with is xirtami, and I'd urge you to avoid it.

I suspect rather strongly that you can make an apache install that uses entirely reltive paths fairly easily -- make sure to include a .bat file, shell script, and OS<X equiv to launch it with the correct config file.

Also, don't use port 80 by default. Not only is it a security risk, it'll be a headache for the customer if they already have a server on port 80 on the machine they want to demo on.