NB! I will say right away, that my Tomcat is running on Ubuntu Server 10.10 under VMWare Workstation 7.
So here it goes. Recently I installed YouTrack issue tracker on my local server, that runs on Tomcat. Very soon I got tired from typing every time (ip_address/webapp_name:port). So I looked up how to create a very simple VirtualHost for Tomcat.

To create Tomcat VirtualHost you just need to edit tomcat_dir/conf/server.xml and inside Engine tag place following code:

<Host name="virtual_host_name" appBase="webapps/your_app_name" unpackWars="false" autoDeploy="false">
	<Logger className="org.apache.catalina.logger.FileLogger" directory="logs" prefix="virtual_log." suffix=".txt" timestamp="true" />
	<Context path="" docBase="path_to_your_webapp_from_root" debug="0" reloadable="true" />
	<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="virtual_log." suffix=".txt" pattern="common" />
</Host>

So in the end you will have to add this virtual_host_name to your windows hosts file and link to your VM ip address. Then you will be abble to access your like: virtual_host_name:8080.

If any question will occur don't hesitate to ask.