Current features list:

• Adds thumbnails to Google/Yahoo/Bing search results
• Adds search engines to the default Safari's search tab
• Adds Favicons to tab labels
• Adds keyword search from address bar
• Adds new tab position option (right/left/leftmost/rightmost)
• Adds tab closing using middle mouse button (or CMD-Click)
• Focus last selected tab
• Type-ahead support (auto cmd-f)
• Sets the focus on the search field when opening a new window
• Adds Amazon's information banner on Google/Yahoo/Bing search results
• Adds a "Max Window Size" menu item to resize the Safari window
• Autocomplete search phrase
• Adds bookmark separator
• Adds bookmark actions
• Dated download folders
• Auto-Closes download window
• Undo "Close Tab" (cmd-z)
• Localized to Japanese, French, Polish, German, Spanish, Italian, and Korean

Pre-Safari 5.1 only:

• Re-opens last session when Safari starts
• Adds full-screen browsing capability
• Forms autocomplete always on
• Always open links in a new tab

http://www.machangout.com