Need a multi-user photo sharing site?

50 people went on a trip and we'd like an easy way to share photos.

My ideal sharing site would look like this:

* Each user can create an album within a common site

* Each user can edit photos in their own album, view and comment on everyone's albums, download full resolution photos

* Simple interface, some of the travelers are seniors who won't be able to keep up with flickr's jumpy interface

* I'm willing to pay a setup fee, but not ongoing membership or maintenance fees

Bonus points if:

* We can also upload and download small videos

* The interface doesn't try to push the user into slideshows

Is there a sharing site that meets this description? Or most of it?

Thanks