The Nautilus Elementary version for Ubuntu 9.10 Karmic Koala had a patch for undo / redo functionality but this wasn't added to the Ubuntu 10.04 Lucid Lynx version.
Until today that is - because Nautilus Elementary 2.31 (for Ubuntu 10.04 Lucid Lynx) re-adds the undo / redo functionality.
Another change is a compact menu added to the "gear" like button on the right of the toolbar which is displayed when the menu is hidden:
These two features is not yet available in the Nautilus Elementary PPA but if you can't wait, you can compile it (it's really easy!):
sudo apt-get build-dep nautilus
bzr branch lp:nautilus-elementary
sudo make install
Then restart Nautilus:
The undo / redo functionality as well as some other features are planned to be added to the original Nautilus package sometime, but until then there's always Nautilus Elementary (and hopefully the new Nautilus won't bring Nautilus Elementary to an end because it's been simply amazing so far, adding features and simplifying things which a lot of users wanted in Nautilus).