When you join an addition WFE server to your farm, SharePoint will automatically deploy the necessary ExCM and Alert Manager 2007 resource files. The only thing you will need to do is....
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Purchase and install and additional Alert Manager 2007 and ExCM license (our products are licensed per WFE server) to your new WFE server.
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Modify your web.config files to include the necessary Forms-Based-Authentication information, namely the connectionString, peoplePickerWildCard, membership, roleManager and profile provider information (you may have other changes depending on your configuration). You should be able to copy the web.config files (FBA zone, Windows Zone, Central Administration) from your initial WFE server to your new WFE server
Jeremy Luerkens
Manager, Software Production
SharePoint Solutions