Well there's a few pretty important points to make about The Children of Húrin for anyone who hasn't (or has, actually) read The Silmarillion.
* This is an easier read than The Silmarillion.
* It is a greatly expanded version of Chapter XXI of The Silmarillion, "Of Túrin Turambar", BUT...
* Reading The Silmarillion is not necessary.
* It is told in a narrative voice.
* The narrative voice falls somewhere in between The Silmarillion and LOTR in style.
* Húrin is a great hero amongst men.
* His son, Túrin, is whom this story is chiefly about. His daughter Nienor makes a late, but significant, appearance. Significant enough for this book to be called The Children of Húrin.
* You will recognize a few names from LOTR, but don't look for furry-footed Hobbits. A Balrog makes a brief appearance, as does a dragon.
* Unlike some posthumous publications of Tolkien's, there is only one footnote in the entire narrative, and it doesn't interrupt the flow of the story. It's inclusion wasn't necessary, but the information was nice to know.
* There is an Index of Names at the back of the book to help the reader keep track of who is who.
* As always, a well detailed map is included.
* Read the Introduction. Christopher Tolkien does a wonderful job preparing the reader who hasn't read The Silmarillion for what is to follow.
It's definately worth buying it imo. As with The Silmarillion it certainly has a much darker and sinister feeling than the LOTR series... And if you're a Blind Guardian fan then that makes it a little more special as well