Talk about necro-ing a dead topic! I just had to, though. The Chronicles of Riddick is one of my top 5 favorite movies of all time. Sounds silly coming from someone who studied film in college, huh? I don't care. Riddick contained everything I love in a movie - it was a mixture of sci-fi, fantasy, and action; the costumes and sets were amazing; it was completely original; and it had Vin Diesel kicking ass. Say what you want about Vin Diesel, but all the action heroes of yesteryear are aging (yet they still keep trying - Die Hard 4 anyone?) and we need new blood.
I know a sequel (actually two) was planned for CoR, but I'll be extremely surprised if it ever happens. If it does, though, you can bet that I will be at the midnight showing of it and I will be geeking it up.