Ross,
I accidently deleted your message, I posted it above...

>Are there limitations on the HTML that can be added to the
>archive body?
>
>My site template uses javascript for menus and has a flash
>logo. Could either of these be an issue in GF?
>

Ross,

The only limit is with the PREVIEW, not the actual pages being created. The PREVIEW uses javascript and if your template also use it, it will mess up the PREVIEW ONLY.

However, your pages will still be OK and will incorporate your javascript.

Run in test mode and check the actual page created.