i got a HDTV and wasnt very impressed when i first plugged in using the supplied composite cable..
so i got the component cables and was glad i got them. on an HDTV of a certain size i would recommend them to anyone over the standard composites..
remember the wii itself doesnt give out a 'HD' signal, it will only go upto 480p, i think its referred to as EDTV (but my memory could be wrong there...)
but yeah, up the dubs!