Microsoft has an amazing Wedding Planning Notebook to use within Microsoft OneNote.
With multiple tabs/sections, it's easy to keep all of your digital details in one place.
OneNote is basically a digital notebook. You're able to add pages, move them around, and capture all of your thoughts, pictures, data, all in one place.
I have modified this particular template for what I need. This is particularly helpful for the tech-savvy bride and groom, especially with saving pictures and screen-shots you find online (no more multiple photo folders, word documents, etc. this handles it all).