I rather not have highlighting by colors by default. If/When we do, it should be only via CSS, so that i can override the damn thing in my user agent as i want. OTOH i would not mind some light highlighting via bolding and italicizing... much like enscript(0) does w/ default level of language highlighting (or as the highlighted text appears in black-and-white on paper).

(0) http://people.ssh.fi/mtr/genscript/