Wizard like data entry

This is a "stateful" type processing, and you can do redirects after
each submit.
Also you can keep track of the time of the last state, and then use
rufus-scheduler to
run a cleanup task from time to time.

There is also a call in rails to let you redirect on the server, so on
the submit of step 1,
you redirect to the beginning of step 2.

You must also thing of the condition where the user stops in the
middle.

Rails after all is stateless, so your state should be in a table
somewhere.
Also depending on your implementation your step 1 etc may actually run
in a different
mongrel process if your doing load balancing.

If you need help, drop me a line.

My blog: http://mentalpagingspace.blogspot.com