At first I was a bit worried about upgrading as I was on version 8, and not version 9 as this for some reason would not install cleanly.
The upgrade also fixed the issue of none of my browser except for opera being able to run Flash. But now I can return to my Firefox with web developer toolbar again.
The integration with social networks is also a new feature, with the all in one messaging system from empathy. It allows me to be logged into facebook messenger, yahoo, msn etc all at once.
The biggest change for me was moving the maximise and minimise buttons to the top left just like the mac. Takes a little getting used too.
All in all the latest version of Ubuntu is worth upgrading to and at this rate will not be moving back to Windows soon. Only thing now is that I need filezilla functionality to be the same as the PC version and notepadd++ ported over without using Wine.