Unlike Mozilla Firefox's version number bumping game, Apple recently released new Safari with real new features, and increased the version number from 5.0.5 to 5.1.
Safari 5.1 is available Mac OS X Snow Leopard (10.6.8) or later and Windows XP, Vista, and Windows 7. Safari 5.1 is included with OS X Lion. The update for the Web browser application added new features such as Reading List, Resume, as well as New Process Architecture and Better Privacy.
The update also includes a few security patches for both the Mac and Windows versions of the app. Both include a long list of Java-related patches, WebKit updates, fixes for maliciously crafted images, and more.
Safari 5.1 can be downloaded from www.apple.com/safari/
Apple states following regarding the security content of Safari 5.1:
This update contains new features including:
Reading List: Easily add webpages and links to your Reading List to browse when you have time.
New Process Architecture: Safari has been re-engineered for improved stability and responsiveness.
Resume: In the General pane of Safari preferences, you can now choose to launch Safari with the windows from your last browsing session.
Better Privacy: A new Privacy pane in Safari preferences makes it easy to remove data that websites can leave on your system.
Other improvements include:
Private AutoFill: Safari lets you fill out forms quickly while keeping your personal information private.
Find Option: When you use Find, you can choose whether you want to search for text that contains or starts with the text that you type in the search field.
Drag-and-drop Downloads: You can drag items out of the Downloads window in Safari, so you can easily place downloaded files on the Desktop.
Advanced Web Technologies: Safari introduces support for full-screen webpages, media caching with the HTML5 application cache, MathML, Web Open Font Format, CSS3 Auto-hyphenation, CSS3 Vertical Text, CSS3 Text Emphasis, Window.onError, and Formatted XML files.
New Extension APIs: Developers can take advantage of new Safari Extension support for popovers, menus, new event classes, and interaction with Reader.
The detailed security fixes is available at this page.
UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:18.104.22.168) Gecko/20110707 AlexaToolbar/alxf-2.13 Firefox/3.6.19