I'm thinking that it's a bit confusing/annoying playing around with the functions.php file when adding custom stuff to Hybrid tabs, but wouldn't it be possible to make the Hybrid Tabs plugin into an extra widget area?
That way we could all just add stuff to the tabs. So that every new item added to the widget area would represent a tab.
The backside of this is that you would have to do more steps, but I think it would be easier than playing around with the functions file.
Steps as far as I see
1. You should tell where you would want Hybrid Tabs to appear
2. Give it a name (and this name should appear in the widgets section)
3. Go to the new widget section and add a bunch of widget you want to appear
The great stuff is, that now you can use other great plugin widgets in the tabs area like Query Posts, plain text widget (which together with exec-php is a powerful tool) and a bunch of other plugins.