in reply to Code and html separation - always or mostly doable?
with a bit of thought, i've found that it's always possible to seperate the business logic and display logic using HTML::Template. (at least it has been for everything i've written for the last 3 or 4 years).
you may need to spend a bit of time coming up with a decent solution, but it almost always pays off. eg, i used to resort to using CGI.pm's popup_menu() to produce <select>s and then just passing them in as html strings. eventually i sat down and thought up a better solution and the result has been cleaner code with more control in the hands of the designer.
also, don't be afraid to subclass HTML::Template and override parts of it. that road has many interesting possibilities.