A very quick one I've been meaning to suggest: Give sellers the ability to "make an offer" to someone just watching their auctions. Keep the watcher anonymous and all that, as will probably be needed. But I've noticed in some cases people watch my auctions and then seem to forget about them. (Of course, it may be my stuff is to blame). And I know that with eBay's new look, watched items are more in buyers' faces than usual.
More on eBay's look soon. I also have a guest blog post from a friend coming, that I am overdue in putting up.