FreeBSD 7.1-BETA2 has been released, a few option to upgrade :

1. Using csup or cvsup, set tag to RELENG_7

2. Using freebsd-update, just use :

freebsd-update upgrade -r 7.1-BETA2

Download iso files :

• i386
• Amd64

For full release

What is FreeBSD, click here for general review from wikipedia.