The release version is 9,0,31,0 (the last beta was 220.127.116.11 on Nov 20, 2006).
Fedora Users: The official Fedora Flash repository has not been updated. However if you pick:
Option 2: .rpm
Download the Flash Player .rpm for Linux
Install it simply with:
rpm -ivh flash-plugin-18.104.22.168-release.i386.rpm
And restart your browsers!