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According to
Changelog for Opera 9.0.2,
This release is a recommended security upgrade. See the Security section for additional information.
Changes Since Opera 9.01
User interface
Fixed quick find field in Windows panel.
Mail, messaging, and newsfeeds
Fixed high CPU usage while downloading big emails.
Properties can now be accessed within the contacts and bookmarks panel after deleting items.
Image attachments can now be saved using the context menu.
Accessing a news link when no news server is configured will now prompt to configure a server.
Display and scripting
Fixed a DOMParser bug affecting some menu scripts.
Click events are now correctly received in designMode.
Implemented support for Node.selectNodes, Node.selectSingleNode, and Attr.text.
Improved rendering efficiency for repositioned elements, as in Flickr's updated "organizr".
Allow large integers to be used in object declaration property names, as on the comments form on Slashdot beta.
Plug-ins and Java
Fix for playing sound clips on Amazon.
Security
Fixed an OpenSSL RSA signature verification flaw. See the advisory.
Miscellaneous
Multiple stability improvements, including a stability issue on my.yahoo.com.
Improved handling of downloads when the disk is full.
Improved handling of Web site logins on slow connections.
Improved handling of WAP text inputs.
Mac-specific changes
Schubert PDF plugin now works again.
Enabled Web archive filenames with more than 28 characters.
Windows-specific changes
Fix to allow opera to be set as default browser using the prompt at startup.
Fix for attaching read-only files in mail.
Support for the Windows XP Media Center Edition remote control.
Added new settings in the Java section of opera:config to allow you to override the system defined JRE.
UserAgent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7