Is there a simple context-menu add-in that could make-up for the Windows-7 status bar deficiency?

Is there a simple context-menu add-in that could make-up for the Windows-7 status bar deficiency?

Edit: I initially asked about free disk space and selected item size. It has since been pointed out that the selected item size summary is still availiable natively in the details pane. I had read elsewhere (wikipedia) that this was removed along with disk free space, which is not the case. Only free disk space has been completely removed. Selection size is still availiable.