But these are promising:
from: www.hp.com/products1/itanium/advantage/aries.html

"If you are already using PA-RISC, a move to Itanium™ is almost seamless.
Not only does it run the most current version of our enterprise class HP-UX
operating system, but it has complete backwards compatibility with your 32-
bit and 64-bit PA-RISC applications and data sets.  No other company
introducing Itanium™ systems is able to offer anything like this level of
backwards compatibility with their own strategic enterprise operating
systems. Being a co-inventor of a new architecture has some very definite
benefits."

www.hp.com/products1/unixservers/entrylevel/lclass/infolibrary/sysguide.html
  adds:

"HP will continue to support binary compatibility through the introduction
of itanium based systems. As a result of HP’s co-development work with
Intel on EPIC (Explicitly Parallel Instruction Computing), the technology
foundation for itanium, today’s HP-UX, Windows 2000 (NT 5.0), and MPE/iX
applications will run unchanged on itanium. For maximum performance,
customers can recompile applications without source changes."

Frank Gribbin
Potter Anderson & Corroon LLP

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