You can now hit the little "edit" button that appears when you hover over a tag to delete, rename, or recolor it.

Also, the nodes stay the color of the last tag selected, which helps you see what you're working on.

Finally, we have taken care of some server memory management issues and increased the max document set size to 6500. In our tests it takes about 20 minutes to import that many documents.
Happy reading,
- Jonathan