Startup Idea : Digital Wedding Guest Book

I was at wedding recently and the happy couple almost forgot to get anyone to sign their paper guest book. By the time they remembered, many guests had already left and it was a scramble to it round those who were left, some of whom might have been too drunk to write coherently! I propose a digital guest book that can be signed during and after the event with a link to all the wedding photos (official or otherwise) to encourage people to share their thoughts on the nuptials, contributing their memories, stories and well-wishes. This digital record would then tie-in with album printing options, if the couple want a paper record with all kinds of customisation options available. People could even scan in their handwriting to make the book more special. With a digital wedding guest book, the possibilities are endless!