Morphix is better than Knoppix in many ways including the fact that everything is in English. Another live CD I am testing out is Mepis
www.mepis.org. It is good, but needs 128MB RAM to work; has a supplemental CD having a list of programs, but it doesn't work with apt-get.
It is based on KDE, has a graphical partition manager and the best HDD install of them all. If you want to dual boot and partition, this is probably the best?
It is an all American distro.
It is the least well supported of the three distros. But......