How to install
Update: this is now available at Magento Connect
Extract it to your Magento directory
You may need to clear your cache if you have it enabled. It will also be available from Magento Connect soon (and I'll add the link here).
Note: if you have jQuery already installed on your Magento, you'll need to delete the one this extension installs at /js/jquery/jquery-1.3.2.js
Using the extension is very simple. Just go to Admin, and you'll see Gallery->Manage-Items. Here, you can upload and organize your images. Just click Add Item to make new Gallery pictures, and drag and drop them on the left tree to organize them. The extension will figure out automatically what items are categories, and which are pictures.
Then, the gallery can be viewed on the frontend by going to http://www.yoursite.com/gallery/
If you have any feedback, questions, or you find any bugs, please post them in the comments below, and I hope you enjoy your new gallery plugin!
or from Magento Connect