The new Gmail drag and drop feature for attachments and images now works in Safari as well.
We've been posting a bunch recently about new Gmail features built on top of HTML5 and other advancements in browser platforms, but so far you've only be able to drag in attachments and drag images into messages in Chrome and Firefox, and the ability to have new windows outlive your original Gmail window was limited to Chrome. Now, all three of these features work in the newest version of Safari (Safari 5) too.