I've got plenty of help here so wanted to give something back even if it's pretty small
The following code can be added anywhere you want, but I add it to style & edit center column. It displays a facebook like button on your page using the iframe version of the code, but with the benefit that the like button will add the 'like' to the current page url rather than a single url.
In english, you get one of the features of the more complex version of the facebook like button without having to sign up for an account and use their java sdk etc.
Here it is:
<?php $Path=$_SERVER['REQUEST_URI']; $URI='http://www.yoursite.com'.$Path; ?> <iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo $URI; ?>&layout=button_count&show_faces=false&width=450&action=like&colorscheme=light&height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:21px;" allowTransparency="true"></iframe>