I heard that .NET Remoting is replaced by WCF. Can someone tell me some details about it?
See the MSDN White Paper on how to migrate from .NET remoting to WCF:
http://msdn.microsoft.com/en-us/library/aa730857%28v=vs.80%29.aspx
WCF is the unified communications stacks that is intended to replace ASMX web services, .NET Remoting, WSE and a few other technologies, too.