Dave Jones, of EEVBlog fame, has a great three-part series on soldering. He starts with an overview of tools, materials, etc. in Part 1, and then Parts 2 and 3 cover everything from basics, like through-hole component soldering, all the way up through dealing with tiny surface-mount components. Really great stuff with very useful tips; if you aren’t already a fan of Dave’s work you should check out his YouTube channel and/or The Amp Hour podcast he does with Chris Gammell. Many thanks to Dave for all the hard work, great posts, and his Australian sense of humor!