The simplest answer I can give is: I don't know. I'm not at all into this 64-bit thing and don't want to worry about it too much. I'm sure there's interested 64-bit hackers that can correct me on all wrong assumptions I'm making below and who are willing to code it, too. But that said, it's probably possible.
Totem playing
I wrote a new volume widget for Totem, which takes less space than the current one and looks more like other similar volume widgets on the GNOME desktop (i.e. a button with a volume icon on it rather than a largish slider). Nothing new here, you'd say. Well, the nice detail is that you still have press-and-drag behaviour, i.e. you can click the volume button and the popped-up slider will directly have grip/focus. Other apps, such as Rhythmbox, may be interested in trying this as well.
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