Rails: How to change the title of a page?

An improvement on @opsb and a more complete form of @FouZ's:

In application.html.erb:

<title><%= @title || "Default Page Title" %></title>

In the view erb file or its controller:

<% @title = "Unique Page Title" %>

I use nifty_generator's "nifty_layout" which provides with a title variable which I can call then on the page using:

<% title "Title of page" %>

I can also user <% title "Title of page", false %> to have the title just show in browser title and not in the page itself.