If you have an Ubuntu 10.10 Daily build .iso knocking around you can quickly update it to the latest daily imprint using this nifty script by Jeff Stone.
Talking about it he says: -
“I’ve written the following script to help download daily builds. I call it zsync-ubuntu-daily-live. As it is right now, if you execute it with no parameters, it will automatically download the ubuntu and ubuntu-netbook daily build, but it also supports kubuntu and xubuntu. Extending it for other *buntus is straightforward. First it checks for a new build by comparing the timestamp of MD5SUMS. If there’s a new build, it will use zsync or wget as appropriate. You need the zsync package installed.”
The link to the bash script is here: http://pastebin.com/i60CgkiT