Unetbootin looks like a neat tool. However, from the home page, I don’t see 11.0 supported. “Factory” is listed, but that may have been any time, even a long time, before 11.0 gold was released. I saw a post on the Ubuntu forums asking for openSUSE 11.0 support to be added, which at least suggests that perhaps someone else have found that “Factory” doesn’t work.
Do you mean the Windows executable that is in the downloaded DVD? If so, the iso must be extracted to a folder, and then the .exe file executed. I have not tried this method. My understanding is that it should run the openSUSE installation as usual. So, no, you do not boot from it, you install with it.