play wii games on 4:3 (wii settings), so that it does not stretch the picture (and thus show the jaggies even more). use component cables but still select 576i (Aussie Wii), sit back (4 meters) and enjoy.
with 480p, the resolution is good but theres too much jaggies, with 576i and a good hdtv (i have a 1024x768 panasonic plasma which does it well) i don't lose much if any perceivable detail, but the 576i signal reduces if not, at least changes and softens the jaggies. Depends on how well your tv upscales 576i though. i take it, it would be good.
ps. goldeneye007 is cool and this method makes a big difference.
otherways to reduce the jagged looks is max brightness and min contrast, lowering sharpness, but it all comes at a cost to pic depth and quality...always a balancing act. im happy with my 576i and component cable idea.