Here's some useful links including places I've been to so far...

gochile.cl - Fantastic web page with loads of info about Chile for travellers

LiveArgentina.com - Everything you need to know about Argentina travel

Rio Website for visitors - Rio for the English speaking

Ariau Towers - Amazon experience for the eco traveller

lonelyplanet.com - Bolivia - Everything you need to know about Bolivia travel

lonelyplanet.com - Peru - Lonely Planet guide to Peru travel

Guatemala on the web - Plan your trip here

Honduras.com - A guide full of tips for Honduran travel

Belize.com - Useful web site to travel in Belize

Mexonline.com - Mexico in a website

Jason Harley - Stand up comedian - The funniest man I know