I agree with most that Alfredsson will probably get in. I've made the comparison before that to me, he's a bit like Rick Middleton, who many people have called a guy who's just on the outside, but Alfredsson has a better peak as a scorer, and, as others have mentioned, he's the long time captain and face of a franchise. If he has a year like last year this year and next, I think he's a lock for sure.
St. Louis is a funny case that generated a lot of discussion before. I know career numbers have their flaws, but I have a tough time believing the committee will induct him unless he's brings his up by quite a bit. He doesn't seem to be slowing down though, so if he has another 2 or 3 elite level seasons, and then tapers off a bit after that, I think he'll get in.
Datsyuk I don't think is a lock just yet either. He has 4 elite years another another 2 good ones. I think his peak is definitely good enough, and it does seem based on the playoff and so far this year that perhaps last year was just an off year. I think if he can be a 75-85 point scorer with elite defence the next couple years he will probably get in, and the fact that he's been one of the best player for one of the best teams and a 3 consecutive Selke winner will make it tough to leave him out.
Kiprusoff is probably too old to add enough to his resume. He was great his first three years in Calgary and last year, has the cup finals run and the Vezina, but he has two mediocre years in there as well, and hasn't been out of the first round since. It's hard to say because of the lack of great goalie careers other than Brodeur in the past 10 years, but he'd probably need at least a few more years like last year and another great playoffs.
Chara certainly has the credentials to get in with his Norris and All Star selections. I think his career is still probably a bit short if he ended today, but with his commitment to fitness and the fact that he's not going to lose his size, he should age well, and should be a lock by the end of his career.
Luongo is tough. He's one of those guys whose reputation, until the past year, has always been a little better than his award shelf says. He's had some great regular seasons, but not as many as his reputation seems to suggest. His '06-07 year was amazing, but he just happened to be behind two greats and lose out on a possible Hart and Vezina. I think if he can get back to being a consistent Vezina contender after a down year last year (so far this year it's hard to tell if that will happen), and he can have some strong playoff runs (he was fantastic in his first playoffs, and was only really ever bad in the two series' against Chicago), the he will probably deserve to get in. It might take a cup or Vezina to change his current reputation enough to convince the committee though.
Hossa, as someone said, reminds me a bit of Recchi. He's always kind of there, and known as a star, but never really discussed when the really great players are mentioned. I think with a typical career arc, he'll probably get in, particularly since I expect Chicago to have some strong playoff runs in the next 8-10 years, but I think he'll end up being one of those guys who'll have to wait a bit.
Zetterberg...it's hard to argue against someone who's in the top 20 at their positon