Mandrakesoft has released the first beta of Mandrake linux 10.0 for AMD64. Release notes

Features based on Mandrake linux 10.0 Community for IA32.
Improved Serial ATA support, including Promise, Silicon Image and VIA chipsets.
Experimental support for 32-bit GL acceleration for XFree86 supported cards.

Mandrake linux 10.0 Beta 1 for AMD64