I'm from Argentina and new to the Forums. I might be able to help you out on this.
Located in the province of Rio Negro on the Andes Mountains (obviously), next to the city of Bariloche, it is South America's largest resort.
Website: Catedral Alta Patagonia - Invierno 2011 - Cerro Catedral
(in English) - Pass prices have not been updated yet.
It has many tracks. Greens/Blues on the bottom and mid section. Rest is mostly blues and reds with a couple of blacks, which are not really ideal for snowboarding as they have many moguls. One thing though is that you won't find a track that will take you from top to bottom. Tracks are connected via "cat tracks" that tend to be a bit complicated for the starting snowboarder, mostly because of the shallow space and flat sections.
The the North and South end of the mountain give you can access the backcountry area. The north side is pretty decent, however, most skiers and snowboarders hike to the southside (La Laguna) wich is a lot better. Video here: fuera de pista "la laguna" cerro catedral bariloche - YouTube
Obviously, there is un-groomed snow between tracks if hiking is not your thing and still want to get some powder. There are also some spots where you can ride through trees. (mid to bottom section)
Lately, Bariloche has not been getting a lot of snow. It has all been down to a matter of luck. It is very hard to find the whole mountain covered in snow and be able to ride from top to bottom. Most of the times, eventually you will have to take a chair to get to the bottom, unless you wanna ride dirt and rock. I believe this is because of the altitude of the resort. Anyways, the mountain is very big and the mid and top sections should be more than enough for you to have fun.
Every year, at the end of august, beggining of september we have the Storm of Santa Rosa which delivers a massive amount of snow.
There is a park with 3 booters, boxes, rails, small ramps for you to have fun jumping and jibbing. There is a RUMOR, that they're building a halfpipe. If you're good enough, you can put your name down for the freestyle competitions that are held and make a couple of bucks while you're at it.
There is good number of lifts, however most of them are outdated. They are pretty slow meaning long and sloppy lines. Most people rent equipment and you'll find them going over your board. From the bottom to mid-section of the northside, there is a sixman lift that goes at a nice speed. On the southside, there is a 4 man gondola. The rest are either 2 or 4 man lifts and T-Bars.
As said before, it is the largest resort in South America and it gets VERY crowded. Avoid July. It is high season and winter vacation in school. Meaning even more people. Lately, we have been receiving thousands of Brazilians, turning Bariloche into Braziloche. Most of them are seeing snow for the 1st time and will only stay at the base.
Bariloche has been for over 50 years a traditional destination where high school seniors from all over the country take their graduation trip. You'll see them dressed all alike chilling in the mountain, maybe taking a 30min class of skiing. Reality is that they have a bunch of day activities to justify the trip to their parents. The true nature of the trip is getting hammered at night. But that means even more people at the base and in town.
Locals from Bariloche, and Argentineans in general, are very friendly and easy going. You'll find that they'll gladly try to help you, even if they can't speak your language, although you will definately find many people that can speak English in case you need directions or anything.
The Town & nightlife:
Bariloche is a pretty big town, I'm not sure how many people live there, but the downtown area is very nice. There are multiple restaurants and bars to hangout which is where most of the action happens. They are open until 6am. Bariloche gets a 8/10 in nightlife in my scale. There are a couple of big clubs, but they are restricted to high school seniors on their graduation trip only.
Where to stay:
You can either stay in Bariloche, 5km from the resort, or you can stay at the base. Downside of staying that the base is that it is pricier and there is no nightlife, but you're only a hundred yards away from the lifts. In the town of Bariloche you have all sorts of hotels and hostels depending on your budget. There are buses that will take you to the mountain, however most hotels and hostels offer a shuttle service to and from the mountain.
Full listing of hotels, hostels, cabins, etc: Lodging in Patagonia Argentina - Bariloche: hotels, cabins, hostels, bungalows, aparts
How to get there:
You will have to fly to Buenos Aires 1st, from there you can either fly to Bariloche's Airport or get a bus ticket (20hr ride approx)
Air ticket from Buenos Aires to Bariloche is about 1800 hundred pesos. While the bus ticket ranges from 800 to 1100 pesos. As of now, 4.41 pesos = 1 dollar
Biggest Resort in South America
Variety of places to stay
The sights from the mountain are breathtaking.
Crowded - Avoid July!
A bit expensive, depending on your budget
Snow quality and quantity depends on luck
Hope this helps. I will try to add more useful links later as I have to go now. I will write a similar for Las Leņas.
Any questions that you have, post them and I will try to respond the best I can.