These are some interesting links for birdwatchers:

• The community database for bird song recordings from tropical America; xeno-canto
• Birdwatching Dot Com is a website about birds and birdwatching. It includes reviews of birding optics, field guides, and birding software. It offers birding tips, stories and lore, and interviews with authors
• Birdingpal, Brazil
• Bird Links to the World
• Fat Birder web site Birding Resources