So here's a thread to talk about it... :)
CamelCase, { } or comma separated... : I personally don't mind the CamelCase. it takes less space (chars), especially if one is using the same tags all over, not just in IQ. But I think that it could be even simpler : each term put in the WikiTags field (camel case or not) should be a WikiTag, and only for those longer expression would there be a need for {} or what ever. The field already defines specific data, so why also use "{ }" ? IMO "{ }" should be used only to reference WikiTags from other fields.
Right now, IQ isn't really using a real WikiTag system anyways... since writing a word put in { } (or [ ], or camel case... in other progs..) in any field doesn't tranform it into a wiki link as it would in a wiki application.