This release holds a few records - it is the most long-awaited release of ReactOS, it is the release which was preceded by 3 Release Candidates instead of usual 2, and at last ReactOS release never had so many changes since the last one.
This release's main feature is the networking ability - it's the first release where it is possible to download and install FireFox and browse the web, get mIRC (or some other irc client) and get to #reactos to chat a bit with developers. Or install command-line Samba-TNG client via the built-in package manager and use it to share files with Windows, Linux and MacOS X (all of them support SMB protocol)
http://www.reactos.org/xhtml/en/news_page_22.html