Given this, it amazes me how primitive the location features of travel guides are. When I buy a Lonely Planet guide, even as an eBook, at best I get a small, low-res map with numbers that cross-reference a list of labels that cross-reference the actual blurbs about these places! This is very slow and labor-intensive to scan. What I really want is a way to overlay the travel guide on top of my phone's Google Maps, so I can easily see my current location, any markers I've added like my hotel, and travel guides all in a single map. I want to be able to click a location marker to get the travel guide's blurb. Bonus points if I can easily combine different travel guides onto a single map (Lonely Planet, Wikitravel, etc.)
One awesome thing this would allow is for people to create and curate special-interest travel guides. For example, the Puget Sound Business Journal maintains a list of attractions called "The Geek's Guide to Seattle" (http://www.bizjournals.com/seattle/blog/techflash/2009/08/Th...). I would love to be able to search for these kinds of guides when I visit a new city and combine all of them into a single map. Sort of like Amazon Listmania lists, it would give you an opportunity to find like-minded people and what they think is cool.
This is a lot like what KML allows in Google Earth (and maybe Google Maps too?) but very few people use this format and the workflows for using KML in this way don't seem to be very streamlined (for example, it appears you can "import" a KML file into maps, but you can't subscribe to one by URL).
Established content providers for travel guides might not like this approach because it commoditizes them, but I think it would help the best content to ultimately win out.