Thanks for the posts..

Shunt... yes I've suggested the web servers and applications servers be network load balanced in the proposal.. but never been part of or witnessed setting up such environment before.. although I've programmed for this sort of environment. Some network expert here may be able to throw some light on home capacity planning is practically calculated and done..

Kovan.. yes you're right.. but we did consider both remoting and web services option and decided on the latter as its much easier to implement.. and any other systems within this clients's domain may reuse these services later... and abt boxing/unboxing we intend to define the interfaces using datatypes like datasets, string, decimal, int etc

What do you think about session management? Although I prefer to suggest session state management mode to be in the database, for now I've recommended sticky sessions where the session management is Inproc. This is cos I wasn't sure if the database could be Oracle... has anyone tried this? Is session management support extended only to SQLServer and not any other database?