I have just purchased a 27' inch iMac (2011 version) with Mac OS X Lion. I have already installed Windows 7 x64 on it with bootcamp and was wondering what was currently the best way to put Ubuntu 11.10 on my machine? I would prefer to use a USB stick for installation if possible. I noticed that there appears to currently be issues with rEFIt and Mac OS X Lion.

If anyone has done this already and can advise me, I would much appreciate it. I would also be interested to hear how well Gnome Shell ran on their Mac.

Thanks in advance.