Attractive, yes. But why, exactly, is this better than my browser's bookmarks?
4 links at the big 128 x 128 size. The sites you check every session.
8 links at 64 x 64. The ones you use pretty frequently.
16 links at 32 x 32.
And heck, maybe 32 at 16x16.
I would use that.
Not to imply that's degrading it, lots of people have trouble handling the bookmarks menu, and this is much more graphically memorable / understandable, so it's likely they could get it more easily. The buttons are also bigger, which (though I'm HUGELY against large browser chrome) can be useful.