Well, from Canada I'd like to see Class of the Titans and Being Ian. Both have gotten acclaim and from what I've seen, both are promising. I'm dumbfounded as to why shows like Sidekick or 6Teen would be chosen over them. I'd also like to see Atomic Betty and Storm Hawks back on the schedule. Both are still producing episodes and both didn't get horrible ratings when they were on CN.
From Japan, it'd be cool to see D. Grayman, Soul Eater, and Shippuden. They could probably fit in on YAH, but I realize YAH would have to expand a lot. D. Grayman and Soul Eater have both aired on foreign CN channels, and since Naruto successfully aired on CN, it should (I repeat, should) be logical for Shippuden to air (I won't talk about the deeper discussion behind this, that belongs in the Anime discussion thread). I'd like to see DBZ Kai, too. DBZ is still a popular franchise, contrary to what some believe, and if it was introduced to a new generation of kids, I'm sure it'd be just as popular as it once was. A good non-shonen anime to pick up would be Doraemon. The show has never aired in the States, yet it's one of the most iconic and popular cartoons in Japan. Also, it has aired on foreign CN's as well.
From 4Kids, I think they should pick up Kirby, Right Back at 'Ya, and Sonic X. The characters are popular, and they'd be a nice complement to Pokemon since they're also based on video game characters. I think a lot of the kids who've played the Pokemon games have also played the Sonic games and have played/heard of Kirby. At least I did when I was in to Pokemon.