I would like to be able to drag and drop documents from one Notes database into another, or from one tab to another.
Think for minute how useful this could be. You could embed a folder from one database into an outline in another database (eg. the mail template), and users would be able to drag and drop from one to the other, without thinking about it. Applications that spring to mind:
1. collecting spam into a central repository for analysis (no more forwarding, which loses the headers - users just drag and drop from their Inbox).
2. users who are working on a common project can file their e-mail in a common store
3. drag a document from your inbox onto your calendar to create a calendar entry.
Sure, you can do this with Edit Copy - Edit Paste, or if you're in your mail file, the action button 'Copy Into New...', but they're not as intuitive.