I realize it is not listed as a supported Database. I am interested to see if anyone has tried to install and use it.
there is simple answer here about supporting postgresql 9.
Will Esri support PostgreSQL 9 at 10.1?
Yes, PostgreSQL 9.0.2 will be supported at 10.1.
i hope it helps you...
Wait for ZigGIS 3.0 then you can edit without ArcSDE.
It's still in development.