I definitely understand why business logic should be kept out of the template; I don't see why adding AND/OR support is any worse than having if/if not/ifequal/ifnotequal/for.
During the Snakes & Rubies talk it was mentioned that many times there has to be logic in the template, but just because it is logic does not necessarily make it business logic. The more dynamic a site becomes the more it helps to have better logic available to you in the template. I have seen a few posts on this board where people get tripped up trying to create navigation where the page the user is on is highlighted in the navigation and so is the section, or parent page that the current page belongs to. Yes, this user could create there own custom tag but that is a job for the python programmer and not the template designer. Plus a custom tag then brings the possibility of putting html into the python code where it is out of reach of the designer.
