If you visit https://www.google.com/ig, it will redirect you to http://www.google.com/ig, without the https for secure. Yes, Google is making sure no one can access the secure version of iGoogle.

Here is a server header check from SEO Consultants:

There are several complaints about not being able to access the secure version of iGoogle at the Google Web Search Help forums. Paul from Google explained why this is the case. In short, the gadgets on the secure iGoogle were not always secure, which led to confusion. Here is the detailed explanation:

Valid excuse, but what would be nice (I know it is more work) would be to give gadget developers a way to create https enabled apps. If they are enabled, they work on the secure iGoogle, if not, Google explains why they are not working on the secure iGoogle.

Forum discussion at Google Web Search Help.