I decided to create a fun hidden mickey social site. You can see the ones that other guests have saved, and share your own. Visit it on the web at Disney Podcast.net - Hidden Mickeys to get started. Or visit it on your smart phone, and take the experience in-park.
And if you have an iPhone, you can download the app that allows you to easily share from your phone, and see what's near you.
note: right now, its only available for WDW