Rails integration testing

I need to know which library to use for integration testing.
I am currently exploring Rspec on Rails for writing unit tests and now
I need something for integration testing. I guess I could use Story
Runner but guess there is not much documentation available on it yet.
I have read that people are also using Selenium-RC, WebBrat etc..
I would like to invite users' comments on how they do integration testing.
Thanks,
Shashank