Using GM against GMail

[Steve Hueners]

I'd like to decorate elements on GMail's page so that I could, for example, inject a tooltip that would fire (displaying my annotations) on a rollover of Gmail's 'labels' buttons. As I research GMail, GM and jQuery, i'm coming up with clearly outdated material. How can I best see an overview of what can and can't be done by GM specifically against today's GMail page - a hosted GA for Business account, for what it's worth. Am also interested in contracting some consulting services relative to GM's use on GMail.

Many thanks
--steve...