Carthago delenda est is the same phrase in the nominative case; Carthaginem delendam esse is an accusative infinitive.
Respiciendum est judicanti ne quid aut durius aut remissius constituatur quam causa deposcit; nec enim aut severitatis aut clementiƦ gloria affectanda est.
The complete quote is quidquid id est, timeo Danaos, et dona ferentis ("Whatever it is, I fear..."; ferentis as an archaic form of ferentes, a form often used by Virgil).
For those without linux, Humanumesterrare - To err is human
Just did a Google search on the Gentoo site and a general search, which gave me plenty of sites for obtaining a live CD, but none with specifics on how to make one.