Awesome resource. Has all the current army lists in there, from all the books.
Smile! It's not that bad! '05: Pixie Jam Trophy winner '07: A Small Matter of Honour Runner Up '11: Bruce McGrath Award '12: Bruce McGrath Award '14: Pixie Jam Trophy Winner '15: Bruce McGrath Award 1974-Present: Awful dice rolls
As with most army builder options, make sure you check the list against a book. Excel builders in particular are so very easy to screw up.
Personally, I prefer EasyArmy. Sure, you pay a small fee for each book you want to use, but they get updated very quickly when errors get pointed out, and the output is extremely helpful in-game.
Smile! It's not that bad! '05: Pixie Jam Trophy winner '07: A Small Matter of Honour Runner Up '11: Bruce McGrath Award '12: Bruce McGrath Award '14: Pixie Jam Trophy Winner '15: Bruce McGrath Award 1974-Present: Awful dice rolls