PCManFM is arriving "dangerously" to 1.0 final (now it's jusrt a release candidate). A lot of improvements within, like external thumbnailer support, new file attribute dialog, support for modifier keys on drag and drop, symbolic link creation, individual wallpapers per desktop and documentation. See the changes and download (if you like to compile by yourself). Or wait for Lubuntu repos update. It won't be too late.
Via LXDE Blog.