In reply to DaveR:
You lucky bastard!
Second for Frey (Cathedral), incredible place. Stacks and stacks of climbing. Almost entirely big, multipitch trad, take plenty of cams including micros and big stuff.
Valle Encantado for apparently the best sport climbing in Argentina. I didn't make it here because of timing - I think climbing is restricted until March or somewhen, check the dates. Others I met went after and said it is awesome.
Cochamo - Chile. There is some cragging, sport and trad, but its all about the big walls. So much rock, and a really cool place. Time consuming place though, not easy to just turn up and tick a few climbs off. allow 2 weeks minimum to make it worthwhile I reckon. Again, plenty of cams are pretty essential.
Neither (Frey/Cochamo) are ideal places to learn aiding really, especially if you don't have the gear, but there are plenty of friendly and helpful people about if you have some time and are really keen to give it a go.
I don't think there is any info online regarding routes or much other stuff for these places, and there are no guidebooks. For Frey, you can get hold of little a5 booklet with handrawn topos (and ridiculously understated approach times!) at the Alpine Club in Bariloche and at the refugio once you get up there. For Cochamo, it is just a ringbinder in the refugio with original handrawn topos. You need to pick your route then re sketch them or take a photo. Plenty of Beta and recommendations available from talking to everyone once you get there. Looking at the grades on your profile you will have loads to go at. Not much below 5.11b in Cochamo though!
If you want anymore info, send me an email and i'll be happy to help.
Enjoy!
