I am currently using EditGrid to plan my wedding. From everything to creating mailing labels to keeping track of RSVPs, gifts, budgets, song lists and more. This way all the different parties can check in to see progress and everyone is accountable for staying on budget!
I love being able to access the lists from work, home, my sister’s or mother-in-law’s houses. I tested a few other online spreadsheets before I settled on this one. Also the chat feature has been very helpful when discussing guest lists.