ah ha! Just posted TONIGHT in IGN Wii's mailbox:
"Funny you should mention the aliasing issue, as I was just thinking about it while playing Wii at the IGN office. Contrary to popular belief, press doesn't get any super-special rock-on cables that make everything look amazing, and it's fair to say we're seeing the same issues you are. Just a few weeks ago Matty-boy and I each got a 40" Sony Bravia, along with matching slacks, teal blue polo shirts, and a saint of a puppy named Fredrika. Also we hug more than we should.
Ok, so the extra stuff wasn't true, but we did each get a Sony Bravia, and the aliasing is more noticeable than ever. Unfortunately, that seems to be the price for Nintendo going with 480p as the signal of choice rather than diving into HD. Developers can use anti-aliasing to pretty up the visuals, but without the slick look of HD I'm afraid we'll always be haunted by some level of jaggies. Nintendo made the choice to focus primarily on the 4:3 480i family, and that's where the system seems to fit best. That being said, component cables certainly give the game a crisper look and stronger color, but it comes at the expense of seeing every little visual imperfection that games may have. Aliasing is one of those imperfections. "