Here is a screencast done by Anunay Kumar (Test on Enterprise Portal team in Redmond)  - http://channel9.msdn.com/posts/diwakarb/Sreencast--Deploying-EP-in-NLB-configuration

 

This screencast walks through the steps involved in configuring Enterprise Portal on a NLB web farm. The attached PDF describes step for deploying MOSS on NLB.