Port -- "You keep using that word. I do not think it means what you think it means."
Can you rewrite an existing PHP application in Ruby to run on the Rails platform? Sure. Go for it. Looks interesting.
But dumping a "directory" of PHP code into an RoR app isn't going
to do, well, anything useful 
FWIW,
/* hat tip to 'The Princess Bride' */
Sorry. Maybe integrate will do? Do you have any suggestions for a person whose english is not his native tongue?
I perhaps wrongfully assumed that basic CS terms like "port" -- and FWIW I don't have a CS degree -- would be pretty universal. Sorry.
Thanks for the info! Now I know what to say to my boss
Maybe you can talk him into sponsoring the port/development of a
clickheat-functional-equivalent gem/plugin. That would be cool
Let us know how it goes!
I set up this, or something similar a while ago.
I just put it on its own server, rather than on a particular website, & configured it accept data from a number of sites. As I did not want a php site & a rails site on the same server - just to keep my environments seperate.
Google analytics & crazyegg.com provide similar functionality. Google is free & there is a free version of crazyegg that might be all you need.
It works really well on flat html sites - not quite so well on Ajax heavy sites.
I found the information really helpful & it seemed to convey more info than just raw numbers - so its definately worthwhile.
rgds, - matt.
