Opera Software has released the final version of Opera 7.20 for Windows, which it claims as a "substantial upgrade" proving "our determination to break new ground with every major release." That said, the improvements look a tad incremental from where we're sitting, with the major impact for most users being the speed increase from fine-tuning. Opera doesn't quantify this, but users in Opera's discussion groups seem to be finding it noticeable.
http://www.theregister.co.uk/content/6/33002.html