I decided to weigh in on this topic because I agree that tracking non-wordpress pages in Wassup would be very useful feature to have.
As this topic was already brought up in "Wishlists", Michele, perhaps you should consider adding it as a possible milestone for Wassup 2.0?
It would not be easy to implement, but I think it is doable using a combination of javascript and an action.php request. For example, in the target non-wordpress page, you could embed a javascript file like, "wassuptracker.js", and in that javascript file, do a call to the Wassup module, action.php?action=trackurl" as an ajax request similar to "spy". Looking at how other stats trackers do their javascript tracking could help reduce the amount of work involved.
The major problem with this method is that it would not be possible to track certain bots and visitors who have javascript turned off. As a consequence, Wassup's numbers for non-wordpress pages would be less accurate than those for Wordpress pages/posts. Despite this, I think this feature that would be an asset to Wassup and could attract more users.
ps. This thread belongs in Wishlist, not Support...is there any way to move it?