if Ubuntu @ Atom then no special set-up has to been done?

['2+]

so the wikipedia says:
Intel Atom is the brand name for a line of x86 and x86-64 CPUs (or
microprocessors) from Intel

i think the next pc i would might be one of those mini-netbook oriented machines
then the cpu might become C7 or this Atom

ubuntu team seems to also have thangs like:
Ubuntu Mobile Internet Device (MID) Edition
Ubuntu Netbook Remix
then what makes the difference?
using the normal-alt -x86 or x86-64 version
to build a light-weight CUI machine
is not recommended for Atom machines?

-- 
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