Zeta is not the only choice for the future of BeOS.
Beside the 'free' BeOS r5 Personal Edition' which works on x86, there are efforts to rrecreate BeOS in a FOSS version. There has been significant progress made on an opensource and source-compatible system to replace the BeOS r5.0.3. Much of the 'kits' that are already done can be used as drop-in replacements for their counterparts in BeOS r5 due to it's modular design.
It started out as 'OpenBeOS', but to avoid any legal repercussions in the future the name was changed to 'Haiku OS'. Those of you who've spent time in BeOS and seen the NetPositive error messages will have an idea of where the new name fits into BeOS history.
Here's the link to the Haiku page:
http://haiku-os.org/learn.php
and here's the link to the folks trying to keep the 'post-Be, Inc.' efforts to keep the Be style of OS alive:
http://www.beunited.org/
Also to Hakimoto. If you want to run BeOS and Sylable, go to
http://www.bebits.com/
and get the AtheOS-FS file system add-on
http://www.bebits.com/app/2028
to use the AtheOS file system (which IS also the one used by Syl,) while in BeOS. Somewhere there is a download of a Syl. image file & QEMU package you can use to try Syl. in Windows. I don't have it on hand but will try to put it up later. There is also a ReiserFS add-on for BeOS
http://www.bebits.com/app/3214
as well as a few others.
DLazlo