There is also a free Apple iPad Remote App that lets you control your Apple TV (as well as iTunes, etc.)...very useful if for nothing other than having a keyboard to input those long passwords and conduct searches.
Monoprice is absolutely the best place to purchase cables and accessories of any sort. They carry first quality products at über reasonable prices, their customer service is excellent and delivery is extremely fast. (Amazon cables are great too...I've just always used Monoprice).
Enjoy your new Apple TV!