My friend Alison Gianotto (aka snipe), has written a nice photo gallery package (Snipe Gallery) that is simple to set up, administer, modify, and use.
So I decided to install it, play with it, and upload some pics. The result is that if you now go to the “Photos” section in the menu on the left, you see the galleries (using Mambo’s wrapper). [Note: this is a very old post, so the menu item and link is no more].
Now that she is also using Mambo, perhaps there will be a component in the future so the integration will be nicer. But as it is “it woks for me” (am I easy to please or what?).