I’ve just removed the original content from this post because it’s no longer accurate for the current versions of WordPress. Today the instructions vary depending on which blog template or framework you use.
Back in 2008 when this post was published the majority of WordPress themes only had one sidebar in a left or right column, or both. There were no themes with simple to use page builder options either. Now most themes have other widget areas, especially for the footer. It’s just as well because its no longer so simple to add a bit of code to the end of a page or post template.
There are now function files and bits and pieces of code in various folders. I don’t need to go into detail about these and I’m sure you’re relieved. Built in options and extra widget areas are easy to configure from your dashboard.
Some themes are built around widgets such as the Genesis Framework and it’s Studio Press Child Themes. This makes them very adaptable and easy to manage.
I’m not going to recommend any particular themes here, otherwise this post will soon be out of date again. You can see which themes I’m currently recommending on my Recommended Resources Page.