The inventor of Java is switching to the Mac too. Considering recent M$ and Intel idiocies, I would say it's high time for you to start thinking about it as well. . .

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Q: Some corporate users have expressed an interest in using .Net for the front end and Java on the back end. How does that strike you?

A: It's certainly the case that Microsoft pretty much has an absolute monopoly on the client. Certified and convicted. And so in some sense that makes it sort of easier for them on the client end. I think these folks would be amazed to discover how easy it is to write client software on the PC in Java. That works very well. And from a personal point of view, I personally actually read the [Windows] XP license and decided I couldn't sign it. So I've been shifting over to Mac.

Q&A: Java creator Gosling says .Net falls short of expectations | Computerworld News & Features Story