64-bit version of Boost for 64-bit windows

As a short answer:

bjam --toolset=msvc-9.0 address-model=64 --build-type=complete

As a longer answer, here are my build notes for having VS .NET 2008 32-bit and 64-bit boost libraries in the same hierarchy (which is I suspect a common use case):

1. Build the win32 binaries

   bjam --toolset=msvc-9.0 --build-type=complete stage
   

2. Create the directory lib\win32

3. Move the contents of stage\lib to lib\win32
4. Remove the directories bin.v2 and stage

5. Build the x64 binaries

   bjam --toolset=msvc-9.0 address-model=64 --build-type=complete stage
   

6. Create the directory lib\x64

7. Move the contents of stage\lib to lib\x64
8. Remove the directories bin.v2 and stage