Simple bulk editing options
You can bulk edit metadata for dozens or thousands of records.
Make a quick Album, search and add items, add more or remove some items until you have the exact collection you want, and then with a few click edit metadata for entire set.
Keyword editing for the set is very flexible. You can append extra keywords or remove nominated keywords without overwriting other keywords. And it is presented in a friendly tag cloud format.
You can also add metadata from spreadsheets to your assets. In fact you can download metadata, edit it and re-apply it to your assets. Every time an image is edited, the data is re-injected into the thumbnail, preview, master and derivatives, on the fly. That means when you download an image it will have the latest, correct metadata embedded in it, including copyright and usage restrictions.