But I'm not sure I understand it.
Is is like the other DEs? Anything special I should know? I'm just looking around to see what out there. So, far, I've tried LXDE, E17, KDE, Gnome, and XFCE. As I recall, Openbox was a bit less of a GUI? I'd have to check my system again. But before I boot into it, I'd just like to know what to expect.
Openbox is a window manager, not "a little less than a gui". Just a window manager, but with some advanced features to allow shortcuts to be used and configured for anything and for all uses. (See the wiki Openbox for information if you are interested to use more the keyboard and less the mouse). If you start to Openbox only, you will probably get a plain black screen (the root of X) with a funny right-click menu providing entries to programs that you may not even have.
This is of course if you installed only the package "openbox". Even if it comes along with a theme.
If you installed task-openbox, you will get a little more, as Leiche has done a good meta-package which pulls in several applications I think are needed to make it more like a desktop manager, but, you will still have a little work to do : read the post-install messages and copy some files from one place in the system to another in your home, so that the right-click menu contains entries to what you really have in the machine, and not the default.
But, if you have Lxde, then you already have Openbox, as window manager, therefore you may want to stick to it, because Lxde is a desktop manager, and brings in all that is needed to complete Openbox, which doesn't provide panel, menus, etc...
Finally, if you have the wish to try Openbox standalone, with configurations ready to use and easy to start with, I invite you to read the presentation of the PCLinuxOS Openbox edition, here:OpenBox Desktop
and the presentation of the PCLinuxOS Openbox Bonsai a little lower on this page, and here