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):
Build the win32 binaries
bjam --toolset=msvc-9.0 --build-type=complete stage
Create the directory libwin32
- Move the contents of stagelib to libwin32
- Remove the directories bin.v2 and stage
Build the x64 binaries
bjam --toolset=msvc-9.0 address-model=64 --build-type=complete stage
Create the directory libx64
- Move the contents of stagelib to libx64
- Remove the directories bin.v2 and stage
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