One easy way is just to add a counter field and then +1 it each time it's viewed. I do this:
if not (item.seller==auth.user_id or is_bot(request)):
item.update_record(views=item.views+1,
modified_on=item.modified_on, modified_by=item.modified_by)
I have 2 exceptions: bots like Google and if the author is viewing the page
(I don't count that).
You could also just rely on Google Analytics and not have to do any
programming (other than inserting Google javascript into all your pages).
