It can be hard to find the right category for a new wizzle. What I do when I'm in doubt is > search Squidoo for similar topics > find lenses in that topic > find out what category they're in > try the same category structure on Wizzley.
That works nine times out of ten because the Wizzley category structure is so much like Squidoo - with a few improvements of course (not just sucking up, I mean that).
Oh, and do bother finding not just a category, but a subcategory and a subcategory of that as well: go as deep as the system allows. Much better for your internal linking within Wizzley.