[Handycam]

• The browser drawer (I try not to call it "tabbed browsing")

I would love to see this go away, become a pane, or a preference for different ways

• Site-specific preferences

While it's true that OW's site preferences are well-implemented, it still need some things you can actually get in SafariStand namely ability to disable plugins per site

• Useful ad blocking, especially combined with site-specific CSS

I am currently enjoying the implementation of Glimmer Blocker. It is a prixy, so it works with OW too

• Keyword shortcuts in the location bar
• Custom searches

You can get both of these in Safari in several ways: Glimmer Blocker, Glims, SafariStand to name 3. And it is built into Firefox.