Gnome Shell is now improving on a daily basis. I have been using it often and finding it getting better and better.
Though other than the UI related changes, for users like me, there is nothing much to try now at this stage, but with the introduction of the left hand side dock like icon panel it seems we can expect more in the coming days.
One such expectation from my end is to see something like widgets which will be available by right-clicking on the desktop. Something like the KDE desktop widgets will be just great to have in the new gnome shell.
Widgets like the system-info, weather, news / news-ticker (scrolling), twitter, facebook, IM contact lists etc. will be a great addition.
Now we have to wait and see when such widgets are added to the new Gnome Shell.