>>2.6.24 is developed for Ubuntu Long Term Support Server
>>and won't have new OVZ features compared to 2.6.18.
>>i.e. we are currently very much commited to 2.6.18-RHEL5
>>and will add features there (even to stable branch) as long as needed.
> 
> 
> Does this mean that the 32-bit iptables problems on 64-bit hosts will  
> be fixed in 2.6.18 OpenVZ kernel?

MUST be fixed (the only known big problem is ipt_ULOG).
There was a number of compats added in latests kernels to fix 32/64 issues.
What exact problems do you refer to? Can you point to them or to bug you have in mind?

> Would be nice as we plan to move all hosts to 64-bit but have 32-bit  
> guests at least for a while.

That's common usage scenario and we do our best to support it as good as possible.

Thanks,
Kirill