kumarovski

I've used most of these, the best one is http://weddingsnap.com The other ones while free are difficult to use because the guests don't download them. They changed their name recently to http://eversnapapp.com and they'll even do live web/streaming to a projector. The main reason I liked them is because they had awesome support. We got 4000 photos from 30 guests at my brother's wedding. The guests ended up uploading all the photos to the album via SMS, email, web, and droid/iphone apps.