Travel guides for blackberry?

I travel alot and was wondering whether the following existed for blackberry devices.

City and Country guides, I'm going to Australia and hate lugging around books.
Popular walking tours

Voice guided tours. I'm not sure if any of you have tried this, but I've been on coach tours where different voice recordings are triggered once you hit a set of gps coordinates. The same for the self guided tours in museums. Seeing as how most handsets now have GPS I'm surprised I haven't seen the technology taken advantage of yet.

Any feedback would be greatly appreciated.

Probably not exactly what you are looking for and you may already have this, but Live Search Mobile has been helpful in finding things for me when I have traveled abroad.