Got this yesterday from the F-Secure guys:
This message is sent to everyone participating to the F-Secure Home Server Security beta program.
We just released a new beta 2 version of the product. It is available for you to download through this link:
http://support.f-secure.com/beta/downloads/fshssbeta.msi
The installation of this version works in the same fashion as with the previous beta. You can download the latest release notes and the quick installation guide through these links:
Release Notes:
http://support.f-secure.com/beta/downloads/fshssbeta.rtf
Quick Installation Guide:
http://support.f-secure.com/beta/downloads/whs_qig.pdf
All the feedback such as bug reports should be sent to us by e-mail at address av4whs-beta@f-secure.com.
Yours,
F-Secure beta piloting team
So, go download the update now 🙂

Is WHS just a testing platform in which to release
The whole point of a beta is to find the bugs and get rid of them. No one should ever expect a beta, especially a beta 1 product to be bug free. I have been running the beta and I havent experienced any problems so far – same for beta 2.
As for the corruption bug, this will be fixed in Power Pack 1 which will be released shortly.