Comment 4 for bug 87281

I still think it would make sense for builds to be underneath their source packages -- or more precisely, under the relevant source package release. So for example, you could drill down through
https://launchpad.net/ubuntu/+source/firefox
https://launchpad.net/ubuntu/+source/firefox/2.0.0.2+1-0ubuntu1 (which already has a portlet with build links)
https://launchpad.net/ubuntu/+source/firefox/2.0.0.2+1-0ubuntu1/+builds/304058
https://launchpad.net/ubuntu/+source/firefox/2.0.0.2+1-0ubuntu1/+builds/304058/firefox-gnome-support

All these pages would have the source package as their context object, so for example clicking the "Bugs" tab on any of them would go to <https://bugs.launchpad.net/ubuntu/+source/firefox>.