Just a quick note that in addition to RW7 previews in the private forum here, we’re still posting RW 6 betas on the public forums in the Beta Releases forum.
It’s worth noting that every category and thread has an RSS feed generated for it on the forums so you can just sub to, for example, http://forums.realmacsoftware.com/c/rapidweaver/beta-releases.rss if you want.