For those of you also using Firefox, it has an extension called Fast Dial that is functionally nearly identical to Speed Dial, though it's configuration is a bit more right-click-oriented and a bit less drag & drop. But it can be configured quite accurately, and looks and feels very much like Speed Dial. I love it. It has the additional advantage of showing as a normal folder in the Bookmarks Menu.
As per many of your comments, I prefer thumbnails too and Fast Dial can be set up that way by simply blanking out the link to icon in Properties for each item.
I keep checking back here once in a while to see how Opera is evolving, as there's a lot I like here. When last I checked, bookmarks and syncing weren't mature. I'm looking again now.