Plugins - SMERF
Add to favoritesSMERF is a Ruby on Rails plugin that allows you to easily create dynamic forms which you can use for surveys, questionnaires, data collection and other forms. It records which forms a user have completed and saves the users responses so that they can easily be analysed via SQL. Currently forms are defined using YAML files.
There's some interesting stuff here and lots of potential, but after playing with this a bit I wouldn't recommend throwing in too much effort to making use of this currently (v0.02)