What Photo-Sharing Website Do You Use?

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?