Even though Intel was slow to embrace the x86-64 standard, it has had it's Itanium server processor for quite some time now. Intel and Microsoft are now partnering up to to enlighten the world on the benefits of 64-bit technology:

According to Microsoft and Intel estimates, 2005 will be the year when, for the first time, the vast majority of new server hardware and high-end workstation shipments will be 64-bit capable. Three factors are contributing to this shift. First, Intel's entire line-up of server platforms will have 64-bit capabilities. Second, the Windows platform will support two different 64-bit architectures: Explicitly Parallel Instruction Computing (EPIC), supported by Intel's Itanium processor family, and 64-bit extensions to the x86 instruction set, supported by Intel's 64-bit Xeon and Pentium processors. Third, organizations are increasingly viewing these platforms as a cost-effective alternative to the higher-priced, proprietary 64-bit architecture of RISC-based UNIX servers.


Source : Microsoft Press Pass