Download Opera 10.50 for Windows from this page - http://www.opera.com/download
Other cosmetic changes come in the form of the new Zoom interface overlay menu in the right hand corner that gives a bar like control for zooming a web page to maximum three times the original size. Even the Address fields have been made smarter.
For security while browsing, Opera 10.50 offers Fraud Protection and Extended Validation certificates. Opera also brings a Private browsing option with this version of the web browser wherein users get an option to open up a private Tab or Private window. Get more overview of all changes made in this final version of Opera 10.50 here.
Opera 10.50 Mac and Linux version are expected soon.