I'm going to keep using Silverlight for now. We only use it internally so multiple browser support is not critical. That said Mozilla, and Chrome work with it. Mozilla is very slow. Safari on PC doesn't work, but I understand they make Silverlilght for Safari for Mac. So if we do end up doing online mapping I will keep this architecture. I am looking forward to the new Web Mapping app for Portal, but if it costs an arm and a leg we will skip it.