Simply Beautiful.
Though I love the clean, elegant, easy to read look of 4E, it really just can't compare to this new Hacklopedia. The book itself is a work of art.
They are also apparently intending to release the beta pdf of the Player's Handbook before GenCon. It is going to continue in the style of the HoB, although David Kenzer has said it will look even better.
Although I suspect it'll be a long delay between the pdf and the print edition, I love the way they are releasing their product now. It gives us an early peek at the material while also allowing us to catch errata and help them make things clearer in the text. Win-win.