Wiki

• A Guide to Soldering from Kitronic is a complete guide to the art, including video demonstrations.
• How to solder is a more light-hearted and amusing but nevertheless informative resource from Technology Will Save Us. (You don't need an expensive soldering iron though - it just makes it a little bit easier.)
• Surface mount soldering - What you can do and how to do it by supplementing the tools you probably already have with a few inexpensive extras.