When I'm geocaching, I sometimes want to go to geocaching.com to view more info about a particular cache or to search for more caches in the area.
My PDA is a Treo 600 and I am able to view geocaching.com and do searches, etc. However, it's very time consuming and painful to do. Turning off images in my PDA's browser helps a lot, but going through search results is still very very time consuming.
It doesn't help that when I hit the back button it has to reload the site. That's probably just a problem with my browser (even though half the memory of my Treo is allocated to cache), but perhaps there are meta tags that cause search results to expire that shouldn't be there for a lightweight version of the site.
Users who subscribe to geocaching.com should be able to view a very lightweight version of the site that eliminates most of the formatting and images and just displays the cache info, hints, and comments from users. Also, the search page should have multiple forms on the same page so that an additional page hit isn't necessary to do different searches.
The slowest part about surfing the web from a PDA isn't downloading large amounts of data (at least, that's not the slowest thing). The slowest part is the overhead of each additional hit. Downloading one 100kb image is much faster than downloading ten 10kb images.
In other words, a lightweight version of the site would be designed to eliminate images and unnecessary formatting and minimize the number of pageviews necessary to do things.
I know this sounds like a lot of work, but here are really only 3 pages to be concerned about:
1. the search page
2. the search results page
3. the cache info page
I'm already a subscriber, but even so, a lightweight version of the site would be worth subscribing for all by itself, so I have no doubt that you would get more subscribers as a result of this.