@Lenny:
Do you think that it is safe to use 2.1 BETA or better to use 2.0.1?
Every production system we run internally (3 colo datacenters, office, all of our boxes at home) are on 2.1. The biggest risk is that which is inherent in any nightly snapshot builds of anything, upgrading. If everything works on the particular snapshot you're on, it's not going to break. Unless you follow development very closely, there's always risk in upgrading to snapshot builds. Though when you're running a pair you can mitigate that, upgrade the secondary, disable CARP on the primary, after verifying the secondary is good, upgrade the primary. Or if possible, just don't upgrade at all until a RC or release comes out, since those are QAed and automatic snapshot builds aren't.