JK Rowling is going to appear on the Today Show on Thursday and Friday.  Other portions of her interview with Meredith Viera will be on Dateline NBC on Sunday.  The article online tells us who the character was that JK Rowling decided not to kill:

“Mr. Weasley, he was the person who got a reprieve,” Rowling said.
“When I sketched out the books, Mr. Weasley was due to die in Book 5.”

Boy am I glad she spared him!

Rowling also talks about her plans to write a Harry Potter Encyclopedia which will reveal details of characters that were left out of the books.  So prepare your libraries and book stores for another round of Harry Mania!