I'll be starting by reading The Grey King today since I'm still working my way through the sequence for the first time. I read the first two books (Over Sea, Under Stone and The Dark is Rising) in October 2012 for my 100 Chapter Books Project over at The Estella Society and I read the third book, Greenwitch, as an RIP read in October of this year. I can't wait to finish up the series now (this book and Silver on the Tree) to see where it all goes. It's a really smart and fun series with great protagonists and some seriously scary villains. If you're interested, now would be a good time to try it out!
Trusting in the Old Ones to prevail,