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I have written a couple of real mode and protected mode boot loaders in the past mostly as a learning experience. I am now looking to write a boot loader and kernel that can take advantages of the 64-bit processor architecture that is currently taking over the market. Any links to related material would be greatly appreciated.

And for 64bit emu: http://bochs.sourceforge.net/
But you have to compile the source by your self for 64bit support!

btw, here's some example code to get you into long mode from DOS:
http://64os.rsgraham.net/modules/wiwimo ... deSnippets