New! Ubuntu 11.10 allows you to test your install CD or USB straight after you have created it, neat!
I used the Startup Disk creator and the downloaded Ubuntu 11.10 on my laptop with Ubuntu 11.10 already installed. I created a Live Ubuntu system on a 4Gb USB memory stick and am now given an option to test it out as soon as the files and bootloader have copied across. The test fires up QEmu in a small window and allows you to run or install Ubuntu in a virtual machine.
I tested this out by opening up firefox and browsing to slashdot.org
and it all just worked, network and all (I am a local pub running an install party).
I also installed the indicator-workspaces package from the Ubuntu Software Center. When you run indicator-workspaces (I ran it from a terminal window) you can set the number of workspaces you feel you need. An indicator stays in the top panel so you can change your mind as well as quickly jump between the workstations (if you forget Ctrl-Alt arrow-key keyboard shortcut).