I downloaded it (Hilton one) today. As mentioned above, it is little more than the website loaded into an app, but I assume it is good to be able to check your HH reservations quickly. (i.e. giving a cabbie the address of the hotel you need to go to).

Not that it matters, but it is much harder to develop for the blackberry because you have to develop for each model. With that being said it doesn't look like this one took much effort to begin with.