I went looking around online to see if i could find out a true changelog, (i haven't noticed one on here yet... )
but i copied this from
The Symbian Blog incase anyone wants to know :)
New features
* Flash Lite 3 support added
* Widget (Web runtime) support added
* Default year changed to 2008
Improvements
* General stability improvements.
* Pre-defined access point kept after switching to different type SIM card.
* Localization improvements.
* Standby time improvements.
* Improvements to BT headset interoperability.
* Improvement to Calendar data restoring.
* Switch from landscape to portrait mode & screen rotations improvements.
Browser
* Improvement to long text writing to web page text boxes.
* Browsing from WLAN wizard improvement.
Media Player
* Localizations improvements in Music player.
* Windows Media Player recognizes device as Nokia
N95.
Gallery
* Image rotation improvement in album view.
* Gallery & Slideshow performance improvements.
Messaging
* Improvement to SMS reception.
Java
* Midlet installation improvement.
* Improvement to Java application start.
* Java midlet certificate checking improvement.
Navigation
* General improvements to Maps application.
* Localization correction to Search in Maps application.
* Improvement to Navigate To -function when started from search application.
SIM
* Contact names with accents and more than 11 characters can be copied to SIM card.
I'll be doing my update after work (stupid work getting in the way)