=== Jesse (again2) ===
I've made a [http://www.squarefree.com/bugzilla-ui/spice-3col.html proposal] that uses a "3 columns at the top, 2 columns in the middle" layout (similar to current BMO layout) but based on the page with improved grouping and "(edit)" links. It saves a significant amount of vertical space, gives more room to the URL and whiteboard fields, and IMO looks pretty good. See [http://www.squarefree.com/bugzilla-ui/changes.html this page] for a list of changes I made.
* The yellow header bar linking to mozilla.org seems completely useless. Maybe make it a footer, or just delete it entirely?
=== Jesse (3) ===
In response to Silver:
It's true that at certain resolutions, votes and last-modified have been traded for dependencies in my mockup. But at most resolutions (especially once the header gets fixed), strictly more information is available without scrolling down.
I don't know why you're seeing the URL field become smaller in my mockup than in the reference; it's bigger for me. Perhaps you're using a browser other than Firefox trunk and the CSS to stretch the fields isn't working?
In response to Dolske:
Wow, getting rid of the form element borders helps a lot. Some CSS could be used to simply hide the borders of inactive form elements:
.subtle { border: 1px solid transparent; padding: 1px; }
.subtle:hover, .subtle:focus { border: 1px inset black; }
This seems to work pretty well for <input type="text"> and <select>.
For fields that are next to each other (e.g. product/component), I guess the first part (e.g. product) would need to be plain text that is replaced by a form element when clicked, so it doesn't take up space equal to the length of the longest product name.
I like a lot of your other ideas.