Flores Eken from ITQ Consultancy in the Netherlands is also an enthausiast VMware SDK programmer. He wrote this application in C# based on the new ESX3.x /VC2.x SDK. It allows you to easily setup all portgroups and VLan IDs on all your ESX Servers. You can first read out (use the export feature) the network settings of a single ESX Host. With that information you can then setup all your other servers.