User-Agent: *
Disallow: /

#To remove dynamically generated pages, you'd use this robots.txt entry ( from http://webtools.live2support.com/se_robots.php) 
User-agent: Googlebot
Disallow: /*? 
User-agent: Googlebot
Disallow: / 


# from http://gallery.menalto.com/node/77556
User-agent: *
Disallow: /main.php?g2_view=slideshow.Slideshow         # Slideshow
Disallow: /main.php?g2_view=comment.AddComment          # AddComment
Disallow: /rss                                          # RSS and Simple RSS
Disallow: /srss                                         # RSS and Simple RSS
Disallow: /main.php?g2_view=core.SiteAdmin              # Site Administration
Disallow: /main.php?g2_view=core.UserAdmin              # User Administration
Disallow: /main.php?g2_jsWarning=true                   # Sidebar