The reason why the list in Software Sources is only half-ordered is because my sources.list is alphabetized, while the ad-apted ppas are not. A simple request surely — Software Sources with a bit of the old ABC?
Also, why do we have to manually #comment ppa sources? The basic information headings about a ppa should be automatically included whenever we add-apt.
This might seem trivial, but when all this information gets into Software Sources, it can mean the difference between having an intelligent system and a dumb terminal. It should be relatively easy to see exactly where each package originates and who is maintaining what.
Default filters do not supply the kind of information one needs on a growing system/ecosystem. A simple plugin to change the views in Software Sources would be an advance. In fact anthing which increased the functionality from a user perspective would be welcome.
UPDATE: my bugs filed on this issue