Redirect to the post that gravity form just created

There isn't currently a built in way to do this. For one you wouldn't want to redirect because then you lose the ability to have the confirmation. HOWEVER you could include a link to their post in the confirmation/thank you message.

Here is a user that found a way to do this with existing tools:

http://www.gravityhelp.com/forums/topic/show-submitted-post-to-poster-like-in-comments#post-27391

It can also be done other ways using hooks and custom code after the form is submitted. But the method above is probably the most simplest and requires no code.