GroupSpaces lets you upload and share photos through a gallery page in your group. You can sort photos into albums and allow your members to upload photos as well.
If you did not enable your 'Photo Gallery' when signing up, you can do this on the 'Photo Sharing' page found under the 'Files' tab in your management toolbar by clicking 'Files settings'.
You can enable a Photos tab from the 'Tab Manager' page to allow your members to see all the photos you upload. Each album brings up a gallery page which shows thumbnails of every photo in that album. Clicking a photo brings it up in a much alrger size, and allows you to scan through the photos in order. Members can leave comments on albums on this page as well.