If you are getting something like this: 
Test::Unit::AssertionFailedError in 'SessionsController route generation should route the create sessions correctly'
The recognized options <{"action"=>"show", "controller"=>"sessions"}> did not match <{"action"=>"create", "controller"=>"sessions"}>, difference: <{"action"=>"create"}>
./spec/controllers/sessions_controller_spec.rb:108:
You need to fix your restful_authentication specs to something like this (from my git diff): 
     it "should map #edit" do
-      route_for(:controller => "assets", :action => "edit", :id => 1).should == "/assets/1/edit" 
+      route_for(:controller => "assets", :action => "edit", :id => "1").should == "/assets/1/edit" 
     end 

     it "should map #update" do
-      route_for(:controller => "assets", :action => "update", :id => 1).should == "/assets/1" 
+      route_for(:controller => "assets", :action => "update", :id => "1").should == {:path => "/assets/1", :method => :put}
     end

Essentially you need to change your == match to be a hash which includes a :method key. Also, numbers for the :id param should be quoted.

This will probably be fixed on the restful_authentication side since David Chelimsky has posted a patch on github (thanks David!). But, if you created these specs with the restful_authentication generator you may want to just go in and change them yourself. Onward!