Congratulations, you now have a great games syestem with a robust librarey and fantastic online, but where do you go from here? What do you buy to further your console Enjoyment? well, heres a list that might help.  
 
1. If you recieved a Arcade unit for Christmas, one of the first things you should do is get a Hard Drive. That dinky little memory card isnt going to cut it when you want to install games for faster load times and you want to buy TV episodes and addons. ID recommend ponying up for the 120 gb HDD. This is what I have, and I still have 60 gb free after quit a bit Episodes of Tv shows and demos. Its not likely theyre will be a bigger HDD coming soon thats sold seperatly, so this may be your best bet.  
 
2. Get a XBOX Live subscription: One of the biggest things that sets the 360 apart from the PS3 is its robust Online Experince. With Party grouping, stable connectivity, Seemless jumping into games, and Arguably teh most Competitive players, this is the best way to expand your 360 enjoyment. Not to mention you get Netflix streaming, Last FM, and Facebook and Twitter integration.  If these things dont interest you, than be sure to sign up for a Silver Membership. You dont get to play online games, Netflix, Last FM Facebook and Twiiter, but you do get to download Demos and Addons.  
 
3. Purchase another controller: Funs always better with company. Be sure to get another controller if you only have one so you can invite a buddy over for some good old fashion Co Op or splitscreen mayhem.  
 
4. Purchase a Live Point card: those Game addons and TV shows arent always free ya know. Why not purchase some MS Currency so you can enjoy Movie Rentals, Game addons, and TV show episodes. Its always good to have some Digital currency tucked away for a rainy day.  They come in two flavors, 1600 points for 20 bucks, or 4000 points for 50 bucks.
 
5. Get some games: Hey, its called a games syestem for a reason. The perfect companion to your new syestem would be some new games, but which ones? well, this question is hard to answer because everyone ahs different tastes. Do you like RPGs? Shooters? Platformers? Sports games? Theres something for everyone on 360. But heres some recommendations:  
 
Bioshock  
Elder Scrolls 4 Oblivion  
Halo 3  
Gears of War  
Gears of War 2  
Borderlands  
Batman: Arkahm Asylum  
Assassins Creed 2  
Fallout 3  
Resident Evil 5  
Kameo Elements of Power  
Dead Rising  
Left 4 Dead 2  
 
Theres so many great games that you should find just what your looking for on 360.  
 
Well, this should get you on the right track and I certainly hoped this helped anyone who just got a 360. Happy Gaming.