William, you appear to be mixing up different pieces of software.
Lightbox is a cataloguing/organising tool that has been around in different versions for five years or so. It's cheap ($25) and not enormously powerful. Great for the price, though. Nothing to do with Adobe, and as you've seen on their page they are moving over to extras for Aperture rather than updating Lightbox. So far this is limited to an export plug-in.
LightRoom is Adobe's equivalent to Aperture, an 'all-in-one' cataloguing, RAW conversion and image adjustment app.
In theory, Aperture and LightRoom are direct competitors, in practice they cover a lot of the same ground and appear similar but have a quite different emphasis.
LightRoom will usually perform better on old/low-end hardware, supports more cameras and has more image adjustments. If you
have to have vignetting or chromatic abberation correction then Aperture 1.5 is likely to be frustrating.
Aperture has fewer and potentially less powerful image adjustments, but
much more sophisticated organisational tools, more support for moving organisational structures between computers and (to my taste, as a part-time programmer) a better-designed interface. It is also scriptable to a relatively high level, while LightRoom can't be scripted at all.
Ian