The way is: go ahead. If you feel you have content in your mind ready to be made available to others, in a way it can benefit those, start podcasting. Having a pleasant tone of voice is a plus.
I visited Paris last year, Rome the year before. Rome is a truly historical city. History is permanently around the corner. I see Rome as a big wonderful museum. Visiting Rome in April or May is an excellent idea because of the good weather and not very crowded places. A good guide book is essential. Study your trip before going. Learn some historic facts. Learn how to understand what you see. You will be embraced by culture. You will be walking on centuries of history. Each single step is an adventure into knowledge.
This is where i see podcasts and iPods as a major tech and social advance to the cultural tourist. There are some places where you can hire a gadget with headphones to listen descriptive content about that place.
What if you had a website where you could download descriptive podcasts about independent places ? Let's say you are interested in archaeological aspects of the Colosseum. There are several experts on this matter. Could you benefit from their knowledge ? What if you could make those visits guided by them ? There are paintings worth hours of description. Buildings too. Landscapes too.
I see this as a future market being included in travel packages: - here are your tickets and your podcast files or links.
Tools ? Just your iPod or flash memory audio listener.
Other areas of interest are emerging: political usage, educational, advising, literature, etc.
Podcasters can even create level oriented informational casts. Language used for professionals is somehow different to the one used with non experts.
I hope to see this as a natural service really soon. It will be great. I imagine myself visiting the Vatican again but instead of walking and reading, walking and listening. Both approaches are interesting. They can be used together, because it makes sense.
Digital life is finally here. And it is here to stay. PDA's with Wi-Fi, iPods, small laptops are now part of the travel gear. Hopefully batteries continue to deliver the increasing power users need.