The site is growing day by day (and I've been a member for only one week) and you can find learning communities for every taste (including of course Ruby, Rails, Merb, CS and company) some with plenty resources and others with less. Also the people behind LearnHub seem to be active members of the Ruby/Rails ecosystem (too bad their blog has been inactive for some time) and the site itself is built with rails which is one more reason to visit it if you are engaged somehow with ruby yourself :)
LearnHub in 30 Words:
LearnHub: for people who love learning and sharing knowledge with others. It is a set of tools that make learning online fun and engaging, and teaching online easy and effective.
Now, two general, non-technical but quite interesting lessons I recently discovered there:
me as a contact there if you want!