This is a very common question freshers ask me – Should I go for a .NET training or a training on J2ME/iPhone/Android.
Good question.
It is indeed a good question – let me explain why. Most Freshers simply assume that since .NET is pretty well established, they should learn that and never give mobile programming a consideration. Those who ask such questions are more broad minded and have longer term goals.
It is no secret that in the next five years, mobile technologies ( iPhone / Android / Blackberry etc ) will rule the future.
I will not answer this question. Instead I will pose another one 
Learning a technology that belongs to a company is like investing in the shares of the company for long term.
.NET belongs to Microsoft – Share prices of Microsoft is about $25 . ( Click here )
iPhone belongs to Apple- Share prices of Apple is about $288 . ( Click here )
Android belongs to Google – Share prices of Google is about $516. ( Click here )
Personally, I have begun to think of Microsoft as the Titanic.
Cheers!