I’ve just pre-ordered A Dance with Dragons by G.R.R. Martin. I’m so excited! Six years I’ve been waiting for this book. I really want to re-read the whole series in preperation, but they wouldn’t count towards the 100 books in 2011 challenge. Boo. But I’m still excited.
Boudica Marginalia 
I haven't been waiting nearly as long as you, but I'm really excited too!!! It's about time!
I bought A Feast for Crows hot off the presses and so have been waiting what feels like forever! But, as a writer, I can't help but have sympathy for how hard it must be to do something with the scale of A Song of Ice and Fire.
I hope that it lives up to your expectations.
Yeah, me too. I'm trying to keep them reasonable. But I am expecting a high degree of awesomeness.