We know that planning a wedding can require a tremendous amount of organization, especially if your wedding party is spread out across the country.  Email helps a lot, but can’t solve all your problems.

There is one solution, available for free or low cost (depending on your needs and usage) that can help eliminate many of the problems you have with sharing information such as dress photos, to-do lists, reminders, etc.  BackPack from 37 Signals is a highly regarded collaboration tool, noted for its simplicity and flexibility.  You can post and share to-do lists, photos, and have reminders sent via e-mail or to your cell phone.  You can keep your planning private, share it with your party, or make it public for every one to see.  They even feature wedding planning as one of their examples:

Keep your wedding planning simple and organized by listing all your tasks and tracking your accomplishments. As the big day draws near, you'll have a to-do list to be your guide, photos to reference when making decisions, and reminders that can be sent to you via email. Let your whole wedding party be a part of the planning by sharing your tasks and notes. No more need to stress over all the little details. With Backpack at your side, you can get back to looking forward to the happiest day of your life.

For their example, visit http://backpackit.com/examples/archives/personal/plan_and_organize_a_wedding_or_special_event.php.  Real-life wedding plans made public include http://lisabliss.backpackit.com/pub/211154; others show up as you refresh their examples page.