Yes, you can share bookmark lists. But as far as I know you can not limit access once you share it. I don't really want to share my bookmark list with the world, just my geocaching friends. Furthermore, some of my friends use vehicle GPS devices that are not compatible with pocket query outputs, they have to input each cache's coords by hand as we cache. So I would have to share my bookmark list, and they would have click on every single link to get the coordinates for each cache and write them down.
Regardless of the usefulness of this feature for my geocacher friends, this would be a huge help to me. I always make a list of the waypoints and their coords when I go out caching. I use this list to make notes on, to double check the coordinates that were loaded into my gps, and to check off that I have found the cache. Instead of having to make my own list every time, having the waypoint name and coords on the bookmark page would allow me to print that off and use it. Also, since I write down and refer to caches by their waypoint name, having the cache name show up on the bookmark page is about the least helpful bit of information for me.
To sum it all up, I think there are a lot of advantages to having this information shown on the bookmark lists, and no disadvantages. That is why I think it would be a great new feature, and a simple one to implement.
~Bloodycool