I don’t think it’s all that hard to work with WordPress templates, at all. 90% of the time you can simply replace WP’s php (which is normally named the same as the function it is trying to perform: i.e. the_category, the_post, the_author, etc.) with the corresponding EE tags and you’re set. Of course, you have to tweak things here and there, but it really isn’t that difficult at all.
As for Joomla/Mambo themes, those you’d definitely have to view the rendered code and pick them apart from there due to the nature of how components display themselves. It takes much more work, but definitely doable if you have the time and patience…
Just my 2 cents, which is about all it’s worth anyway. :lol: