I just put up a new site today for mobile devices using nothing but Drupal. The main feature of the site is a Google Custom Search Engine that I built to only search trusted (non-profit, government) health sites for health content. It also uses the pre-existing Google refinements for filtering.
So far the site is working great.
Here is what I used:
1. Mobile Theme
2. Google CSE
3. Google Analytics Module
4. Rss Feeds on health
It currently works well on my Symbian driven Nokia e62 and Nokia 770. I will test out Windows Mobile 6 tonight.
Future improvements I want to do do:
1. Build in a health "to-do" list
2. Build in the ability to have a phr on your phone
Here is the site, would love any feedback:
Adam