how to install webserver on tomatousb?

You need to install Optware:

http://tomatousb.org/tut:optware-installation

Then with ipkg you can install one of the webservers compiled for Tomato (Apache and others).

Some instructions here: http://www.nslu2-linux.org/wiki/Optware/Packages?from=Unslung.Packages

You'll have to configure through telnet or SSH.

I've installed thttpd server (apache is a bit heavy for a router) without great difficulties, even if I'm not a super geek.

Hi ,

I see you posted great instruction to install webserver

But I recommend that you should highlight the command for subscriber to easily use

Below is also one post for quickly virtual web server installation on linux :

http://vnluck.com/2012/01/how-to-setup-a-virtual-web-server-in-10-minutes/