Soldering is one of the essential skill required for an electronics hobbyist. These days I was searching for some cool soldering tutorials. And the result was my favourite site INSTRUCTABLES .
You can check this link http://www.instructables.com/id/Soldering/ for a whole lot of soldering tutorials with some of them having videos.
The other web page I found was http://www.sparkfun.com/commerce/tutorials.php?tc=2 . Spark Fun is an amazing website. This website has all its circuit open. You can find a whole lot of tutorials and other thing about electronics from its page.
These kind of soldering skills are essential for hacking devices.
From my experience in soldering 50% of soldering skill is obtained by practice. But the remaining 50% skills can be improved only if you have good tools for soldering. At least have an micro soldering iron with you for doing SMD soldering.