With the masses of photos that you and your loved ones will be taking over the holidays, it's inevitable that everyone wants to see them.
You might use a website that just displays the images, and you might go with a service that also allows people to download the files so they can print and frame as well. I like to use a combo of MobileMe (to accommodate folks immediately after the event and let them download photos) and Picasa, so I can just have an ongoing shared album.
I've also noticed that some people are also resorting to using a social network like Facebook to share their photos. What do you do? Do you stick to one main website, or do you use a combo for your photo-sharing needs?