There are a lot of interesting facets to Rails version 3+ that still have not come to the forefront - even though some folks are already using version 4-beta. Many of the facets involve the fact that engines are now "official", but there are a lot of other cool innovations, like concerns, route constraints, responders, and... oh where to stop?
I personally want to learn more about Rails 3 features:
I had a nice weekend of software development, happened across these links, and found them useful:
¥