FreeBSD + ZFS on a production server?

[Anders Häggström]

Hello list!

I plan to install a web server for production use and ZFS looks very
interesting, especially since it has built-in support for RAID and
checksum.

The hardware is already purchased, a 1U-casis with a PhemonX4 9550
CPU, 4GB ECC RAM @ 800MHz and 2x500GB SATA disks and I am about to
select the operating system to use.

The choice is probably between "Debian 4.0r3", "FreeBSD 7.0" and
"OpenSolaris 2008.05". All of them have their pros and cons.

I think Debian / Linux, almost falls off because it lacks support for
native ZFS and I have not found any alternative filesystem that offer
checksums on the fly.

My main question is: How is the support for ZFS on FreeBSD? Is it
sufficiently stable and fast enough to be used in production yet?
If not, is there any alternative filesystem that offers checksums on
the fly or other similar technology to reduce the risk of a corrupt
filesystem that at the same time plays well with software RAID (RAID-1
in particular)?

Thanks in advance!
Anders