Apple released Safari 3.1 (525.13) for both Mac and Windows users today which comes with a bunch of changes and improvements over 3.0.x series. Here are the set of changes included in the new release.
Developer Menu
The first thing you will notice is the addition of the “Develop” menu (Preferences/Advanced/Show Develop menu in menu bar) item with the following tasks:
Open Page with: (Other browsers installed on your system including FireFox, Internet Explorer, Opera)
User Agent: Set you user agent from the list of options, or enter your own user-agent. Finally! This was previously part of the hidden debug menu and you had no way of specifying a custom user-agent. The other exciting additions here are the ability to set your user-agent as Mobile Safari 1.1.3 for either iPhone or the iPod touch.
You can also pull up the Web Inspector, Error console, Network Timeline and a Snippet Editor. Lastly the Developer menu allows you to disable various browser features such as Caches, Images, CSS Styles, JavaScript, Runaway JavaScript Timers, and Site-Specific Hacks. You can now also edit CSS in the Web Inspector.