We'll respond shortly.
Desert has been upgraded to work with Rails 2, solving problems with ActionMailer templates and Rails load paths.
A reminder: RSpec supports nested describe blocks. This can be useful for sharing setup and also for organization (one describe per method being tested, with multiple it blocks). Some people reported that there are some issues when using nested describe blocks with fixture scenarios. There was also a report of some flakiness around a single it block being run more than once.
One of our projects has reported that they have been using NetBeans and are happy with it.