Lifted from Semergence
(http://www.semergence.com/archives/2005/12/01/10/02/32/)

In config/routes.rb:

map.project ‘project/:projtitle’ :controller => ‘project’, :action => ’show’

In app/controllers/project_controller.rb:

   def show
     @project = Project.find(:first,
                             :conditions => [’title = ?’,params[:projtitle]])
     …
   end

Or something like that. Assuming your project titles are unique. Then
you can also use project_url (since you have map.project in routes.rb)
for urls in your views, e.g.

   <% for project in @projects %>
   <%= link_to project.title,
               project_url(:projtitle => project.title) %>
    …
   <% end %>