I've got a couple of custom scripts which I'd like to pull into the admin side of SS. I'd like to put a new link right at the top (the Site Content, Files & Images, Comments, etc bar) which when clicked would load in my script.php file as the content.

How could I do this?

Thanks

To create a new tab you would just use the getCMSFields() method of the SiteTree class and use addFieldtoTab() on the returned FieldSet object.

I don't know how you would call your custom script within that tab though.