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<< Java. It's hot, hot, hot... >>
I'd say learn ASP.NET and C#, will be the jsp / java killer.
ASP>NET can do server side error checking for both browsers, oncredibbly nice technology and C# is alot lot faster then slow poke java.
btw i know JAVA and C# very well. >>
Learn C# first? Not on your life. Maybe after learning Java... It's pretty hard to find a job learning a language that's still in non-release state.